Add docs for catalog and version endpoints
Add `/v3` prefix to version and server-time docs
Merge pull request #723 from cprice404/maint/1.5.x/docs-for-catalog-and-version-endpoints

Add docs for catalog and version endpoints
Remove references to required 'Accept: application/json' header
Merge pull request #724 from cprice404/maint/1.5.x/fix-json-accepts-in-docs

Remove references to required 'Accept: application/json' header
Merge branch '1.5.x'

* 1.5.x:
  Remove references to required 'Accept: application/json' header
  Add `/v3` prefix to version and server-time docs
  Add docs for catalog and version endpoints