[bug #60332] Document behaviour of soft hyphens in hyphenation mode 0

[G. Branden Robinson]

Update of bug #60332 (project groff):

                Category:                    None => Core                   
              Item Group:                    None => Documentation          
                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #1:


commit 83526199d83e66a2af38082b54394cef9f760d74
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sun Apr 4 20:43:23 2021 +1000

    [docs]: Improve hyphenation discussion.
    
    * doc/groff.texi (Manipulating Hyphenation): Recast description of \%
      escape to emphasize independence of its two uses (e.g.,
      "\%pseudo\%unununium" is hyphenated only after "pseudo-", if at all).
      Add example.  Note that .nh affects only automatic hyphenation.
    
    * man/groff.7.man (Requests/Request short reference) <.nh>: Clarify that
      the request disables only _automatic_ hyphenation.
    
      (Hyphenation): Add new introductory paragraph summarizing manual
      hyphenation support and features, including notice that breaking at
      explicit hyphens is performed in fill mode, i.e., even if _automatic_
      hyphenation is disabled.
    
    Thanks to Peter Schaffter for the report.
    
    Fixes <https://savannah.gnu.org/bugs/?60332>.



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