doc: Clarify where autovacuum_max_parallel_workers can be set

The description of autovacuum_max_parallel_workers did not specify
where it can be set or how it relates to the per-table
autovacuum_parallel_workers storage parameter.

Clarify that it can be set only in postgresql.conf or on the server
command line, and that the limit can be reduced for individual tables.
Add a link to the autovacuum_parallel_workers storage parameter.

Backpatch to v19, where parallel autovacuum was introduced.

Author: Baji Shaik <[email protected]>
Reviewed-by: Sami Imseih <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Reviewed-by: Fujii Masao <[email protected]>
Discussion: 
https://postgr.es/m/ca+fm-rmmbuupwjshxkhob7seiq7xww3ysvnhpmzp1y2i_gt...@mail.gmail.com
Backpatch-through: 19

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/c105ab8157d310d4714153223a6e2a6d9d33d1b8

Modified Files
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doc/src/sgml/config.sgml | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

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