test(doctest): Example config fixture

Author: tony

tmuxp/config.py

@@ -100,6 +100,11 @@ def in_cwd():
     -------
     list
         configs in current working directory
+
+    Examples
+    --------
+    >>> set(in_cwd())
+    {'.tmuxp.yaml', '.tmuxp.json'}
     """
     configs = []