Обсуждение: pgsql: doc: update PG 14 release notes

doc:  update PG 14 release notes

Mostly addition of <literal> tags

Reported-by: Justin Pryzby

Discussion: https://postgr.es/m/20210629022547.GF21248@telsasoft.com

Backpatch-through: 14 only

Branch
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REL_14_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/a3a681f8590d9476c8ce94172316d3d339375fe6

Modified Files
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doc/src/sgml/release-14.sgml | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)