[bug #60926] [mm] use of AT with ms.cov provokes warnings

[G. Branden Robinson]

Follow-up Comment #2, bug #60926 (project groff):

This has been revised to fix a correctness problem.  Calling `AU` without
arguments is indeed valid.


commit 79fb2fd0424063fbf36fd1143346f4154d439151
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Mon Jan 16 12:23:50 2023 -0600

    [mm]: Restore support for argumentless `AU`.
    
    * contrib/mm/m.tmac (AU): Partially revert commit 4fd984adc9,
      2021-07-17.  `AU` can be called for the sole purpose of "closing" a
      document title "opened" with `TL`.
    * contrib/mm/groff_mm.7.man (Macros) <AU>: Update description.



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