add sphinx viewcode extension to add links in rendered docs to view the source code directly

Author: mattsb42-aws

doc/conf.py

@@ -38,7 +38,7 @@ def get_version():
 extensions = ['sphinx.ext.autodoc', 'sphinx.ext.doctest',
               'sphinx.ext.intersphinx', 'sphinx.ext.todo',
               'sphinx.ext.coverage', 'sphinx.ext.autosummary',
-              'sphinx.ext.napoleon']
+              'sphinx.ext.napoleon', 'sphinx.ext.viewcode']
 napoleon_include_special_with_doc = False
 
 # Add any paths that contain templates here, relative to this directory.