Update stale heading anchor (#3445)

Co-authored-by: ZhengYuan Loo <loozhengyuan@users.noreply.github.com>

Global/README.md

@@ -4,7 +4,7 @@ This directory contains globally useful gitignores,
 e.g. OS-specific and editor specific.
 
 For more on global gitignores:
-<https://help.github.com/articles/ignoring-files/#create-a-global-gitignore>
+<https://help.github.com/en/github/using-git/ignoring-files#configuring-ignored-files-for-all-repositories-on-your-computer>
 
 And a good blog post about 'em:
 <http://augustl.com/blog/2009/global_gitignores>