[bug #63002] doc/groff.texi: correct \o example

[G. Branden Robinson]

Update of bug #63002 (project groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #4:


commit 21263eccb2dcbc30508c54cf16515ea8d78a4af2
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Tue Sep 13 09:48:34 2022 -0500

    [docs]: Fix Savannah #63002.
    
    [docs]: Fix errors in documentation regarding which escape sequences
    accept newlines as argument delimiters, and other inaccuracies.
    
    * doc/groff.texi (Escape Sequences): Cover general cases before
      exceptional ones.  Leaders can be used as argument delimiters.  Call
      out letters and numerals as (usually) usable as well.  Correct an
      almost completely inaccurate list of escape sequences that accept a
      newline as an argument delimiter: \A, \b, \o, \w, and \X do; \B and \Z
      do not.  Correct example of use of newline as delimiter with \o escape
      sequence.  Stop referring to the decimal point as an "operator".  Drop
      "newline" from a list of prohibited delimiters by several escape
      sequences since it has already been discussed.
    
    * man/groff.7.man (Escape sequences): Replace weaksauce cross reference
      to our Texinfo manual with a proper discussion of acceptable
      delimiters in escape sequences, synced with the foregoing change.
      Stop using quotation marks around escape sequences, except for "\ "
      which obviously needs it.
    
    Fixes <https://savannah.gnu.org/bugs/?63002>.  Thanks to Dave Kemper for
    the report.
    
    Also adjust dead-tree typography, preventing widow.
    
    Also add thin space escape sequence to let a backslash breathe after an
    opening quotation mark.



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