Today the add/clear voting config exclusions APIs route a request to the
master node but do not expose the usual `?master_timeout` parameter
allowing to change the timeout for this phase of execution. This commit
adds the missing parameter.
Several files in the REST APIs nav section are included using
:leveloffset: tags. This increments headings (h2 -> h3, h3 -> h4, etc.)
in those files and removes the :leveloffset: tags.
Other supporting changes:
* Alphabetizes top-level REST API nav items.
* Change 'indices APIs' heading to 'index APIs.'
* Changes 'Snapshot lifecycle management' heading to sentence case.
David Turner
James Rodewig
James Rodewig
István Zoltán Szabó
Lisa Cawley