Doc: clarify description of current-date/time functions.

Minor wordsmithing of the func.sgml paragraph describing
statement_timestamp() and allied functions: don't switch between
"statement" and "command" when those are being used to mean about
the same thing.

Also, add some text to protocol.sgml describing the perhaps-surprising
behavior these functions have in a multi-statement Query message.

Reported-by: P M <[email protected]>
Author: Tom Lane <[email protected]>
Reviewed-by: Laurenz Albe <[email protected]>
Reviewed-by: David G. Johnston <[email protected]>
Discussion: 
https://postgr.es/m/175223006802.3157505.14764328206246105...@wrigleys.postgresql.org
Backpatch-through: 13

Branch
------
REL_14_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/209a22d794d5257cd57d001a1a456be444d7f42d

Modified Files
--------------
doc/src/sgml/func.sgml     |  6 +++---
doc/src/sgml/protocol.sgml | 10 ++++++++++
2 files changed, 13 insertions(+), 3 deletions(-)

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