Doc: improve cross-references for SET/SHOW.

The corresponding functions set_config and current_setting were
mostly not hyperlinked.  Clarify their descriptions a tad, too.

Discussion: 
https://postgr.es/m/[email protected]

Branch
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REL_13_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/2a01bc275be1a7d117944b1a58ea1fe5f6c377c6

Modified Files
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doc/src/sgml/config.sgml   | 10 ++++++----
doc/src/sgml/func.sgml     | 13 +++++++------
doc/src/sgml/ref/set.sgml  |  2 +-
doc/src/sgml/ref/show.sgml |  2 +-
4 files changed, 15 insertions(+), 12 deletions(-)

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