Update .CONTRIBUTING.md

Co-authored-by: Erin Shaben <[email protected]>

Author: brunopgalvao

.CONTRIBUTING.md

@@ -85,7 +85,7 @@ Before making contributions, you need to set up the proper directory structure f
 
 ### Making Changes
 
-1. **Make Your Changes**
+1. Make your changes:
 
    - Follow the [PaperMoon Style Guide](https://github.com/papermoonio/documentation-style-guide)
    - Test your changes locally (see [Run Polkadot Docs Locally](../README.md#run-polkadot-docs-locally))