[2.7] bpo-34748: link to :ref:partial-objects in functools.partial doc. (GH-9809)

(cherry picked from commit 83a0765)

Co-authored-by: Andrei Petre [email protected]

Author: zhangyangyu

Doc/library/functools.rst

@@ -76,9 +76,9 @@ The :mod:`functools` module defines the following functions:
 
 .. function:: partial(func[,*args][, **keywords])
 
-   Return a new :class:`partial` object which when called will behave like *func*
-   called with the positional arguments *args* and keyword arguments *keywords*. If
-   more arguments are supplied to the call, they are appended to *args*. If
+   Return a new :ref:`partial object<partial-objects>` which when called will behave
+   like *func* called with the positional arguments *args* and keyword arguments *keywords*.
+   If more arguments are supplied to the call, they are appended to *args*. If
    additional keyword arguments are supplied, they extend and override *keywords*.
    Roughly equivalent to::