Minor tweaks to cached_method docs

- Fix doc references
- Use imperative mood in a comment

Co-authored-by: Jason R. Coombs <308610+jaraco@users.noreply.github.com>

Author: sirosen

Doc/library/functools.rst

@@ -147,7 +147,7 @@ The :mod:`!functools` module defines the following functions:
                return DataSet([value + shift for value in self._data])
 
    On instances, :func:`cached_method` behaves very similarly to :func:`cache`,
-   providing :func:`cache_info` and :func:`cache_clear`.
+   providing :func:`!cache_info` and :func:`!cache_clear`.
 
    The *cached_method* does not prevent all possible race conditions in
    multi-threaded usage. The function could run more than once on the

Lib/functools.py

@@ -1236,7 +1236,7 @@ def __get__(self, instance, owner=None):
         return self._get_or_create_cached_func(instance)
 
     def _get_or_create_cached_func(self, instance):
-        # similar to singledispatch(), we want to defer use of weakref until/unless it
+        # similar to singledispatch(), defer use of weakref until/unless it
         # is needed
         import weakref