doc index.rst:
1. Correct heading levels (impacting side nav and correct rendering of content)
2. Remove "Indices and Tables" section: genindex page not used, move search link to intro sentence.
spec instructions.rst:
1. Update page title to be consistent w/ incoming link text (so that link with text "How to submit a spec" goes to a page titled "Submit a Spec")
2. Add section header to first list on page
Change-Id: Ic3071bcf1c8d152c68d6735f08bb97e768aa944f
Signed-off-by: Kristal Dale <kristal.dale@intel.com>
1161e686ec