Update docstrings to give more clarity on the intention of _compat.TraversableResourcesLoader and _compat.wrap_spec (seemingly duplicated). Fixes #227.

Author: jaraco

importlib_resources/_compat.py

@@ -29,6 +29,9 @@ class TraversableResourcesLoader:
     """
     Adapt loaders to provide TraversableResources and other
     compatibility.
+
+    Used primarily for Python 3.9 and earlier where the native
+    loaders do not yet implement TraversableResources.
     """
 
     def __init__(self, spec):
@@ -81,6 +84,9 @@ def wrap_spec(package):
     """
     Construct a package spec with traversable compatibility
     on the spec/loader/reader.
+
+    Supersedes _adapters.wrap_spec to use TraversableResourcesLoader
+    from above for older Python compatibility (<3.10).
     """
     from . import _adapters