Be more explicit how to discover available API calls

I believe it cannot hurt to be slightly more explicit about how
to retrieve API calls and provide examples.

Signed-off-by: David Moreau Simard <dmsimard@iweb.com>
Be more explicit how to discover available API calls

Signed-off-by: David Moreau Simard <dmsimard@iweb.com>
Merge pull request #1026 from dmsimard/ceph_rest_api_discovery

Be more explicit how to discover available API calls

Reviewed-by: Dan Mick <dan.mick@inktank.com>