It is generally considered good style not to necessarily capitalize
every single word in titles, e.g.
https://grammar.yourdictionary.com/capitalization/rules-for-capitalization-in-titles.html
Presumably this is intended to include sub-headings too.
In fact, the OpenStack Documentation Contributor Guide goes even
further away from all capitals:
Use the following guidelines for all types of headings:
* Use sentence-style capitalization.
* ...
-- https://docs.openstack.org/doc-contrib-guide/writing-style/headings.html
And looking at files such as www/stein/user/index.html, we find headings
such as:
User Guides for OpenStack Services
and
User Guides for OpenStack Deployment Tools
where the intention for a lowercase "for" is clear.
So remove the CSS which automatically capitalizes every single word in
headings, and lowercase any remaining articles, prepositions, or
coordinating conjunctions.
Change-Id: I7cc35a1528c0e15c4e1d1fc47d27c2d4ab49e497
809c755219