doc: Improve description of index vacuuming with GUCs

Index vacuums may happen multiple times depending on the number of dead
tuples stored, as of maintenance_work_mem for a manual VACUUM.  For
autovacuum, this is controlled by autovacuum_work_mem instead, if set.
The documentation mentioned the former, but not the latter in the
context of autovacuum.

Reported-by: Nikolai Berkoff
Author: Laurenz Albe, Euler Taveira
Discussion: 
https://postgr.es/m/[email protected]
Backpatch-through: 9.6

Branch
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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/1d1d13bc72aa2d0344520bd2f302262ce2064364

Modified Files
--------------
doc/src/sgml/monitoring.sgml | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

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