[bug #62478] add more documentation of test suite usage

[Dave]

Update of bug #62478 (project groff):

                  Status:                   Fixed => In Progress            
             Open/Closed:                  Closed => Open                   
         Planned Release:                  1.23.0 => None                   

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Follow-up Comment #4:

[comment #2 comment #2:]
> It is not even intended as a test suite for an existing groff
> installation.  Its purpose is to check the behavior of the groff
> system _that has just been compiled on a host_ for correctness.

This scope is implied by the fact that the test suite is typically run via
"make," which is part of the build system, but is it explicitly documented? 
The text in INSTALL.extra introducing the test suite says that it can be used
for this purpose without stating that is its _sole_ intended use.


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