pgsql: Don't install ICU collation keyword variants

Don't install ICU collation keyword variants

Users can still create them themselves. Instead, document Unicode TR 35
collation options for ICU, so users can create all this themselves.

Reviewed-by: Peter Geoghegan <pg@bowt.ie>

Branch
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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/958ffb8c286d93d1bfced17e6300d13f9634b431

Modified Files
--------------
doc/src/sgml/charset.sgml | 98 ++++++++++++++++++++++++++++++------
src/backend/commands/collationcmds.c | 71 --------------------------
2 files changed, 84 insertions(+), 85 deletions(-)

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