[bug #62816] rename the \& escape...again

[G. Branden Robinson]

Follow-up Comment #6, bug #62816 (project groff):

[comment #5 comment #5:]
> It's probably worth cataloguing here all the use cases for \& that have been
cited so far in discussion.  This is likely also an incomplete list.
> 
>  * placing a literal control character at the beginning of an input line
>  * preventing adjacent characters from being kerned or made a ligature
>  * suppressing end-of-sentence detection
>  * making marginalia (numbers or marks) perceive a line as nonblank

Thanks for enumerating these, Dave.  Except for the third, I _think_ all also
apply to the (groff) `\)` escape sequence.

>  * in tbl, aligning numeric columns
>  * in tbl, marking empty entries
> 
> (The last two items sound to me like distinct uses, but they may be variants
of the same thing; I don't know tbl at all.  I got these respectively from
http://lists.gnu.org/r/groff/2022-06/msg00053.html and
http://lists.gnu.org/r/groff/2022-06/msg00017.html.)

They are not the same thing; I implemented the second of these post-groff
1.22.4.


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