[HBASE-22973] [DOC] Update REST Section of Ref Guide to describe supported Content-type/Accept

• Type: Improvement
• Status: Patch Available
• Priority: Minor
• Resolution: Unresolved
• Component/s: documentation

Environment

HBase REST API Endpoints section should detail the expected Content-type and Accept for each resource, as this may influence on the expected result. 

This also fixes some minor typos among the description/examples defined on this section.

• Assignee: Wellington Chevreuil
• Reporter: Wellington Chevreuil
• Created: 04/Sep/19 17:27
• Updated: 04/Sep/19 20:30