Add a section to specify behaviors for coalesced operations

[xw-g]

Add a section to specify behaviors for coalesced operations, with the following "caveats"

• The difference between server and device are not cleared defined yet.
• The word gRIBI entry is not yet clearly defined.
• Wording is not fully optimized.
• Line is not wrapped yet at 80. (will do it in one PR later for all sections.)