adjusted a typo and a doc warning

diegopetrola · diegopetrola · commit 6f0a9dac419a · 2020-08-13T00:58:52.000-03:00
diff --git a/lib/matplotlib/text.py b/lib/matplotlib/text.py
@@ -1068,13 +1068,13 @@ def set_math_fontfamily(self, fontfamily):
         fontfamily : str
             The name of the font family.
 
-            Available font are defined in the
+            Available font families are defined in the
             :ref:`matplotlibrc.template file
             <customizing-with-matplotlibrc-files>`.
 
         See Also
         --------
-        :doc:`/tutorials/text/mathtext`
+        get_math_fontfamily
         """
         self._fontproperties.set_math_fontfamily(fontfamily)
 
