Merge pull request matplotlib#20021 from luzpaz/typos

DOC: fix typos

Author: story645

doc/api/index.rst

@@ -10,7 +10,7 @@ For recent changes, see :doc:`api_changes`.
 
 When using the library you will typically create
 :doc:`Figure <figure_api>` and :doc:`Axes <axes_api>` objects and 
-call their methods to add content and modify the apprearance.
+call their methods to add content and modify the appearance.
 
   - :doc:`figure_api`: axes creation, figure-level content
   - :doc:`axes_api`: most plotting methods, Axes labels, access to 

doc/sphinxext/redirect_from.py

@@ -3,7 +3,7 @@
 ====================================
 
 If an rst file is moved or its content subsumed in a different file, it
-is desireable to redirect the old file to the new or existing file. This
+is desirable to redirect the old file to the new or existing file. This
 extension enables this with a simple html refresh.
 
 For example suppose ``doc/topic/old-page.rst`` is removed and its content