[bug #60228] [ms]: should support footnote marker brackets for nroff mode

[G. Branden Robinson]

Update of bug #60228 (project groff):

                  Status:                    None => Fixed                  
             Assigned to:                    None => gbranden               
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #2:


commit caeede07cd2e6e10134385cca194c52342f46972
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sat May 1 00:13:38 2021 +1000

    [ms]: Render footnote markers better in nroff.
    
    * tmac/s.tmac: Implement alternative rendering for automatic footnote
      numbers in nroff mode, inspired by Heirloom Doctools ms; since
      superscripting is not univerally available on terminals, surround
      number with square brackets instead.
    
      (fn@init): New macro finishes initializing footnote module, setting up
      aliases to par@sup-{start,end} strings in troff mode and otherwise
      defining fn@sup-{start,end} as brackets.  Define * string here, using
      new strings.
    
      (par): Call fn@init after par@sup-{start,end} are defined, and prior
      to other footnote integration material.
    
      (par*fp!0): Migrate from par@sup-{start,end} to fn@sup-{start,end}.
    
    * doc/groff.texi (ms Document Control Settings) <FF>:
    * doc/ms.ms (Footnotes) <FF>:
    * tmac/groff_ms.7.man (Usage/Footnotes) <FF>: Document it.
    
    Fixes <https://savannah.gnu.org/bugs/?60228>.


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