Expand collation documentation

Peter Eisentraut <peter_e@gmx.net>

Commit: f41bd4cb90eb1d93631a346bf71d17dfc4beee50
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-10-02T15:51:45Z
Releases: 11.0
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.

Files

PathChange+/−
doc/src/sgml/charset.sgml modified +107 −28
doc/src/sgml/ref/create_collation.sgml modified +17 −11

Documentation touched