[bug #54101] documentation for .ss either incorrect or incomplete

[G. Branden Robinson]

Follow-up Comment #15, bug #54101 (project groff):

Naturally I'd goof the commit ID when making a reference to Rocky and
Bullwinkle.


commit 3704a6b25e2886fae1491df08a6d6a25f6d4f7ad
Author: G. Branden Robinson <address@hidden>
Date:   Sat May 9 09:44:47 2020 +1000

    Further improve .ss documentation.
    
    More strongly distinguish the minimality (adjustability) of inter-word
    space and fixedness (non-adjustability) of inter-sentence space.  This
    was the main point of the problem report, Savannah #54101.
    
    * doc/groff.texi:
      + Note that negative values are not permitted in either argument to
        .ss.  (Right now the prohibition is enforced by assertion failure
        and core dump; see Savannah #58337.)
      + Add index nodes to help readers find discussion of details of
        spacing between words and sentences.
      + Improve grammar.
    
    * man/groff.7.man: Make descriptions of \n[.ss] and \n[.sss] more
      self-contained.
    
    * man/groff_diff.7.man: Sync with applicable change to groff.texi.
    
    Thanks to Dave Kemper for his feedback.


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