Fix broken documentation

This removes the reference to the iterators and adds projects

Author: sigmavirus24

docs/source/api-reference/index.rst

@@ -15,6 +15,7 @@
     issues
     notifications
     orgs
+    projects
     pulls
     repos
     search

docs/source/index.rst

@@ -48,7 +48,6 @@ There are several examples of different aspects of using github3.py
     examples/git
     examples/github
     examples/issue
-    examples/iterators
     examples/logging
     examples/octocat