pgsql: Doc: fix incorrect EXPLAIN ANALYZE output for bloom indexes

Doc: fix incorrect EXPLAIN ANALYZE output for bloom indexes

It looks like the example case was once modified to increase the number
of rows but the EXPLAIN ANALYZE output wasn't updated to reflect that.

Also adjust the text which discusses the index sizes.  With the example
table size, the bloom index isn't quite 8 times more space efficient
than the btree indexes.

Discussion: https://postgr.es/m/CAApHDvovx8kQ0=HTt85gFDAwmTJHpCgiSvRmQZ_6u_g-vQYM_w@mail.gmail.com
Backpatch-through: 13, all supported versions

Branch
------
REL_13_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/a51ec088dbe54c41ecb3178053da8881d0e2452e

Modified Files
--------------
doc/src/sgml/bloom.sgml | 48 ++++++++++++++++++++++++------------------------
1 file changed, 24 insertions(+), 24 deletions(-)