few comments and docstring

Author: volodymyrss

astroquery/heasarc/tests/parametrization.py

@@ -68,6 +68,7 @@ def save_response_of_get(session, method, url, params=None, timeout=10, **kwargs
         log.info(f'saving output to {filename} for url="{url}" and params="{params}"')
         log.warning(
             f"you may want to run `cp -fv {os.path.dirname(filename)}/* astroquery/heasarc/tests/data/; rm -rfv build`"
+            "you may also want to `git add astroquery/heasarc/tests/data/*`."
         )
         f.write(text)
 
@@ -76,6 +77,10 @@ def save_response_of_get(session, method, url, params=None, timeout=10, **kwargs
 
 @pytest.fixture(autouse=True)
 def patch_get(request):
+    """
+    If mode is not remote, patch `requests.Session` such that all `request`s will 
+    return either a saved response or a locally defined get_mockreturn.
+    """
     mode = request.param
     mp = request.getfixturevalue("monkeypatch")