doc index.rst:
1. Update intro sentence to read as a complete sentence
2. Remove unused toctree
3. Correct heading levels (impacting side nav and correct rendering
of content)
4. Remove "Indices and Tables" section: genindex page not used,
search searches only index (not useful here)
api-ref index.rst:
1. Update intro sentence to read as a complete sentence
2. Update text around search link for consistency (move to
follow intro)
3. Add heading before toctree for consistency with other pages
release notes:
1. Standardize page title reST markup
2. Remove search (make consistent with other openstack release note
pages)
Story: 2004737
Task: 28803
Change-Id: I11ba3784a5d50953d62f0bc4a08f3f2b308da6b5
Signed-off-by: Kristal Dale <kristal.dale@intel.com>