[bug #58035] clarify page offset in doc/groff.texi

[G. Branden Robinson]

Update of bug #58035 (project groff):

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

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Follow-up Comment #6:


commit 6cdb2a543810a2bb2eca2d9c60e03b84d20e8649
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Mon Mar 7 13:35:47 2022 +1100

    doc/groff.texi: Finish(?) fixing Savannah #58035.
    
    * doc/groff.texi (Manipulating Filling and Adjustment): Explicitly
      identify the page offset as an output line property that is not
      determined until a break occurs.
    
      (Line Layout) <po>: Correct error; the page offset for terminal
      devices is set by "tty.tmac", not "troffrc".  (The manual has been
      wrong for a long time; we've had it in tty.tmac since James Clark put
      it there in 1992.)  Recast and tighten wording.  Drop the word
      "horizontal"; there is no vertical page offset (as such) in *roff.
      Drop hand-waving about unexpected results with a description of the
      formatter's behavior.  Dcoument request behavior without an argument
      before getting into the weeds (and CSTR #54 errata).  Migrate
      terminology from "scaling indicator" to "scaling unit".
    
    Fixes <https://savannah.gnu.org/bugs/?58035> [with crossed fingers].


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