git-config: add example for editing in default editor (#4176)

Co-authored-by: Starbeamrainbowlabs <sbrl@starbeamrainbowlabs.com>

pages/common/git-config.md

@@ -27,3 +27,11 @@
 - Revert a global configuration entry to its default value:
 
 `git config --global --unset alias.unstage`
+
+- Edit the git configuration for the current repository in the default editor:
+
+`git config --edit`
+
+- Edit the global git configuration in the default editor:
+
+`git config --global --edit`