Simplify wording of introductory sentence about code-nav

Author: maxbrunsfeld

content/github/managing-files-in-a-repository/navigating-code-on-github.md

@@ -9,7 +9,7 @@ versions:
 
 ### About navigating code on {% data variables.product.prodname_dotcom %}
 
-Navigating code functions use the open source library [`tree-sitter`](https://github.com/tree-sitter/tree-sitter). The following languages are supported:
+Code navigation uses the open source library [`tree-sitter`](https://github.com/tree-sitter/tree-sitter). The following languages are supported:
 - C#
 - CodeQL
 - Go