Fix formatting by removing empty line in index.md

Removed an unnecessary empty line to improve document formatting.

Author: Erkan

content/contributing/writing-for-github-docs/index.md

@@ -10,6 +10,7 @@ children:
   - /about-githubs-documentation-fundamentals
   - /content-design-principles
   - /writing-content-to-be-translated
+  - 
   - /making-content-findable-in-search
   - /versioning-documentation
   - /using-markdown-and-liquid-in-github-docs