Update configuration-reference.md

Fixed a couple of minor spelling errors.

Author: thomasr8

jekyll/_cci2/configuration-reference.md

@@ -103,7 +103,7 @@ working_directory | N | String | In which directory to run the steps.
 environment | N | Map | A map of environment variable names and values.
 {: class="table table-striped"}
 
-<sup>(1)</sup> One executor type should be specified per job. If more than one is set you will recieve an error.
+<sup>(1)</sup> One executor type should be specified per job. If more than one is set you will receive an error.
 
 Example:
 
@@ -153,7 +153,7 @@ branches | N | Map | A map defining rules to allow/block execution of specific b
 resource_class | N | String | Amount of CPU and RAM allocated to each container in a job. **Note:** A paid account is required to access this feature. Customers on paid container-based plans can request access by [opening a support ticket](https://support.circleci.com/hc/en-us/requests/new).
 {: class="table table-striped"}
 
-<sup>(1)</sup> One executor type should be specified per job. If more than one is set you will recieve an error.
+<sup>(1)</sup> One executor type should be specified per job. If more than one is set you will receive an error.
 
 #### `environment`
 A map of environment variable names and values. These will override any environment variables you set in the CircleCI application.