Add main index api doc label for inter sphinx

docs/en_us/platform_api/source/conf.py

@@ -273,7 +273,7 @@ extensions = [
     'sphinx.ext.todo', 'sphinx.ext.coverage', 'sphinx.ext.pngmath',
     'sphinx.ext.mathjax', 'sphinx.ext.viewcode', 'sphinxcontrib.napoleon']
 
-project = u'EdX Platform APIs'
+project = u'Open edX Platform APIs'
 copyright = u'2015, edX'
 
 exclude_patterns = ['build', 'links.rst']

docs/en_us/platform_api/source/index.rst

-##################
-EdX Platform APIs
-##################
+.. _Open edX Platform APIs:
+
+#######################
+Open edX Platform APIs
+#######################
 
 .. toctree::
     :titlesonly: