Update config-cheat-sheet.en-us.md

Author: Mura Li

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -408,6 +408,7 @@ NB: You must `REDIRECT_MACARON_LOG` and have `DISABLE_ROUTER_LOG` set to `false`
 
 ## Git (`git`)
 
+- `PATH`: "": The path of git executable. If empty, Gitea searches through the PATH environment.
 - `MAX_GIT_DIFF_LINES`: **100**: Max number of lines allowed of a single file in diff view.
 - `MAX_GIT_DIFF_LINE_CHARACTERS`: **5000**: Max character count per line highlighted in diff view.
 - `MAX_GIT_DIFF_FILES`: **100**: Max number of files shown in diff view.