Refs #36500 -- Rewrapped long docstrings and block comments via a script.

Rewrapped long docstrings and block comments to 79 characters + newline
using script from https://github.com/medmunds/autofix-w505.

tests/model_meta/tests.py

@@ -51,8 +51,8 @@ class GetFieldsTests(OptionsBaseTests):
     def test_get_fields_is_immutable(self):
         msg = IMMUTABLE_WARNING % "get_fields()"
         for _ in range(2):
-            # Running unit test twice to ensure both non-cached and cached result
-            # are immutable.
+            # Running unit test twice to ensure both non-cached and cached
+            # result are immutable.
             fields = Person._meta.get_fields()
             with self.assertRaisesMessage(AttributeError, msg):
                 fields += ["errors"]