Update configuration-reference.md

Author: michelle-luna

jekyll/_cci2/configuration-reference.md

@@ -382,10 +382,10 @@ A job that was not executed due to configured rules will show up in the list of
 
 #### **`resource_class`**
 
-**Note:** A paid plan is required to use the `resource_class` feature. If you are on a the
-container-based plan you will need to [open a support ticket](https://support.circleci.com/hc/en-us/requests/new) to have a CircleCI Sales representative contact you about enabling this feature on your account.
+**Note:** A paid performance plan is required to use the `resource_class` feature. If you are on a paid 
+performance plan you will need to [open a support ticket](https://support.circleci.com/hc/en-us/requests/new) to have a CircleCI Sales representative contact you about enabling this feature on your account.
 
-After this feature is added to your paid plan, it is possible to configure CPU and RAM resources for each job as described in the following table. If `resource_class` is not specified or an invalid class is specified, the default `resource_class: medium` will be used. The `resource_class` key is currently only available for use with the `docker` executor.
+After this feature is added to your paid performance plan, it is possible to configure CPU and RAM resources for each job as described in the following table. If `resource_class` is not specified or an invalid class is specified, the default `resource_class: medium` will be used. The `resource_class` key is currently only available for use with the `docker` executor.
 
 Class       | vCPUs       | RAM
 ------------|-----------|------