[COMMITTERS] pgsql: Expand collation documentation

Expand collation documentation

Document better how to create custom collations and what locale strings
ICU accepts.  Explain the ICU examples in more detail.  Also update the
text on the CREATE COLLATION reference page a bit to take ICU more into
account.

Branch
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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/b6cbd30582a5a58ef0ce7a16c2b003b318d63619

Modified Files
--------------
doc/src/sgml/charset.sgml              | 135 ++++++++++++++++++++++++++-------
doc/src/sgml/ref/create_collation.sgml |  28 ++++---
2 files changed, 124 insertions(+), 39 deletions(-)


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