Fix use of _ instead of - in docstrings

Signed-off-by: John Pennycook <john.pennycook@intel.com>

codebasin/__init__.py

@@ -184,7 +184,7 @@ def exclude_patterns(self):
     def __contains__(self, path: os.PathLike) -> bool:
         """
         Returns
-        _______
+        -------
         bool
             True if `path` is a recognized source file in one of the code
             base's listed directories and does not match any exclude