Add batch concurrency limits.md

Adding batch compute limits, 10 by default. 

This update was agreed with eng here: https://docs.google.com/document/d/1oPVCECV5-Yew1lSjsgevFEBulHJ4tbmT88jEtHwh95Y/edit

Relevant slack thread: https://twilio.slack.com/archives/C04DFM35ZAQ/p1690853761840139

ZD Ticket: https://segment.zendesk.com/agent/tickets/522833

Author: estgc

src/engage/product-limits.md

@@ -25,14 +25,15 @@ To learn more about custom limits and upgrades, contact your dedicated Customer
 
 | name                                          | limit                                 | Details                                                                                                                                                                                                                                                                                                                                                                        |
 | --------------------------------------------- | ------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
-| Compute Concurrency                           | 5 concurrent audiences or computed traits               | Segment computes five new audiences or computed traits at a time. Once the limit is reached, Segment queues additional computations until one of the five finishes computing.                                                                                                                                                                               |
+| Compute Concurrency                           | 5 new concurrent audiences or computed traits               | Segment computes five new audiences or computed traits at a time. Once the limit is reached, Segment queues additional computations until one of the five finishes computing.                                                                                                                                                                               |
 | Edit Concurrency                           | 2 concurrent audiences or computed traits               | You can edit two concurrent audiences or computed traits at a time. Once the limit is reached, Segment queues and locks additional computations until one of the two finishes computing.                                                                                                                                                                               |
+| Batch Compute Concurrency Limit               | 10 (default) per space                | The number of batch computations that can run concurrently per space. When this limit is reached, subsequent computations are delayed until current computations finish.                                                                                                                                                                                              |
 | Compute Throughput                            | 10000 computations per second         | Computations include any Track or Identify call that triggers an audience or computed trait re-computation. Once the limit is reached, Segment may slow audience processing.                                                                                                                                                                                                   |
 | Events Lookback History                       | 3 years                               | The period of time for which Segment stores audience and computed traits computation events.                                                                                                                                                                                                                                                                                   |
 | Real-time to batch destination sync frequency | 2-3 hours                             | The frequency with which Segment syncs real-time audiences to batch destinations.                                                                                                                                                                                                                                                                                              |
 | Event History                                 | `1970-01-01`                          | Events with a timestamp less than `1970-01-01` aren't always ingested, which could impact audience backfills with event timestamps prior to this date.                                                                                                                                                                                                                         |
 | Engage Data Ingest                            | 1x the data ingested into Connections | The amount of data transferred into the Compute Engine.                                                                                                                                                                                                                                                                                                                        |
-| Audience Frequency Update                     | 1 per 8 hours                         | Audiences that require time windows, [funnels](/docs/engage/audiences/#funnel-audiences), [dynamic properties](/docs/engage/audiences/#dynamic-property-references), or [account-level membership](/docs/engage/audiences/#account-level-audiences) are processed on chronological schedules. Unless otherwise agreed upon, the audiences will compute at the limit set forth. |
+| Audience Frequency Update                     | 1 per 8 hours                         | Audiences that require time windows (Batch audiences), [funnels](/docs/engage/audiences/#funnel-audiences), [dynamic properties](/docs/engage/audiences/#dynamic-property-references), or [account-level membership](/docs/engage/audiences/#account-level-audiences) are processed on chronological schedules. The default schedule is once every 8 hours; however, this can be delayed if the "Batch Compute Concurrency Limit" is reached. Unless otherwise agreed upon, the audiences will compute at the limit set forth. |
 | Event Properties (Computed Traits)            | 10,000                                | For Computed Traits that exceed this limit, Segment will not persist any new Event Properties and will drop new trait keys and corresponding values.                                                  |