doc: Fix glossary entry for data checksums workers

The glossary entry for data checksums workers incorrectly stated that
they were auxiliary processes, but they are implemented as background
workers.  Fix, and while there, simplify the entry by combining the
worker and launcher into a single glossary term.  Backpatch down to
v19 where online checksums were introduced.

Author: Daniel Gustafsson <[email protected]>
Reported-by: Fujii Masao <[email protected]>
Reviewed-by: Fujii Masao <[email protected]>
Discussion: 
https://postgr.es/m/CAHGQGwEv-C9ia+rBYyePzO8F=5fvvs412zqcoupazuob5ra...@mail.gmail.com
Backpatch-through: 19

Branch
------
REL_19_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/602f19c84ca1db471b6264d4965e2becfc00cbbc

Modified Files
--------------
doc/src/sgml/glossary.sgml | 32 ++++++++++++--------------------
1 file changed, 12 insertions(+), 20 deletions(-)

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