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

[Dave]

Follow-up Comment #5, bug #62816 (project groff):

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
 * 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.)


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