pgsql: doc: PG 13 relnotes: hash_mem_multiplier can restore old behav.

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pgsql: doc: PG 13 relnotes: hash_mem_multiplier can restore old behav.

Bruce Momjian
doc:  PG 13 relnotes: hash_mem_multiplier can restore old behav.

Document that hash_mem_multiplier can get query behavior closer to the
pre-PG 13 behavior of allowing hashing to use more memory.

Reported-by: Peter Geoghegan

Discussion: https://postgr.es/m/CAH2-Wzn3kwQm_pe6g2=ki+P7+ZRqH5GvFGn6SWfv_j7UUgcLdQ@...

Backpatch-through: 13 only

Branch
------
REL_13_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/e7a6cd5dcf24c6d4b04d036a4837c7af154c4b49

Modified Files
--------------
doc/src/sgml/release-13.sgml | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)