regs: Enhance multiple chassis documentation

Enhance the multiple chassis documentation for the phosphor-regulators
application.

Some of the documented changes are not yet implemented in C++. Futur

regs: Enhance multiple chassis documentation

Enhance the multiple chassis documentation for the phosphor-regulators
application.

Some of the documented changes are not yet implemented in C++. Future
commits will implement these changes.

Change-Id: I64a5d3f49c6ad0aa66d39631735dab8a7486612f
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

show more ...