pgsql: Doc: update v10 release notes through today.

Doc: update v10 release notes through today.

Also, another round of copy-editing. I merged a few items that
didn't seem to be meaningfully different from a user's perspective.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/c1602c7a1b2e49acbba680cb72949d4fa3a8d2ee

Modified Files
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doc/src/sgml/release-10.sgml | 290 +++++++++++++++++++++----------------------
1 file changed, 144 insertions(+), 146 deletions(-)

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