Action Item:1.2B ICS revision

Action Item  to modify 1.2 B GP ICS
I tweaked the what does it mean, removing 'conformance' from the first 
sentence, changing some works and adding a new last sentence.

What does it mean?
An Implementation Conformance Statement (ICS) provides information about an 
implementation to a specification, by presenting in a uniform manner the 
capabilities and optional features that have been implemented as well as 
the limitations of the implementation..   An ICS typically takes the form 
of a questionnaire or checklist for implementor to complete.  An ICS 
provides the implementor a way to indicate what has been implemented.