docs: escape with backticks

Author: toku-sa-n

git/cmd.py

@@ -812,7 +812,7 @@ def execute(self,
             render the repository incapable of accepting changes until the lock is manually
             removed.
         :param strip_newline_in_stdout:
-            Whether to strip the trailing '\n' of the command stdout.
+            Whether to strip the trailing `\n` of the command stdout.
 
         :return:
             * str(output) if extended_output = False (Default)