Exclude files to reduce whining.

Sphinx whine when files aren't in the TOC's exclude a few to shut it up.

config/all.py

@@ -49,7 +49,7 @@
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
-exclude_patterns = ['themes']
+exclude_patterns = ['themes', 'pdf-contents.rst', 'core-libraries/components/email.rst']
 
 # The reST default role (used for this markup: `text`) to use for all documents.
 #default_role = None