chore: Actualize contributing docs (#14447)

CONTRIBUTING.md

@@ -141,12 +141,12 @@ Constraints can be checked with `yarn constraints`, and fixed with `yarn constra
 
 - Workspaces must point our repository through the `repository` field.
 
-##### Using jest-circus
+##### Using jest-jasmine2
 
-There may be cases where you want to run jest using `jest-circus` instead of `jest-jasmine2` (which is the default runner) for integration testing. In situations like this, set the environment variable `JEST_CIRCUS` to 1. That will configure jest to use `jest-circus`. So something like this.
+There may be cases where you want to run jest using `jest-jasmine2` instead of `jest-circus` (which is the default runner) for integration testing. In situations like this, set the environment variable `JEST_JASMINE` to 1. That will configure jest to use `jest-jasmine2`. So something like this.
 
 ```bash
-JEST_CIRCUS=1 yarn jest
+JEST_JASMINE=1 yarn jest
 ```
 
 #### Additional Workflow for any changes made to website or docs