Fix formatting in CONTRIBUTING.md

CONTRIBUTING.md

@@ -5,11 +5,11 @@ By submitting code as an individual you agree to the
 By submitting code as an entity you agree to the
 [corporate contributor license agreement](doc/legal/corporate_contributor_license_agreement.md).
-All Documentation content that resides under the [doc/ directory](/doc) of this
+All Documentation content that resides under the [`doc/` directory](/doc) of this
 repository is licensed under Creative Commons:
 [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).
-_This notice should stay as the first item in the CONTRIBUTING.md file._
+_This notice should stay as the first item in the `CONTRIBUTING.md` file._
 ## Contributing Documentation has been moved