doc:  remove URL for ICU explorer/locexp
The old URL was HTTP 404 and the git link didn't build.  Also update two
other ICU links.  If we ever get a good link we will add it back.
Reported-by: Anton Voloshin
Author: Laurenz Albe
Backpatch-through: 10
@@ -744,8 +744,8 @@ CREATE COLLATION german (provider = libc, locale = 'de_DE');
set that is preloaded by <command>initdb</command>. Users are encouraged
to define their own collation objects that make use of these facilities to
suit the sorting behavior to their requirements.
- See <ulink url="http://userguide.icu-project.org/locale"></ulink>
- and <ulink url="http://userguide.icu-project.org/collation/api"></ulink> for
+ See <ulink url="https://unicode-org.github.io/icu/userguide/locale/"></ulink>
+ and <ulink url="https://unicode-org.github.io/icu/userguide/collation/api.html"></ulink> for
information on ICU locale naming. The set of acceptable names and
attributes depends on the particular ICU version.
</para>
@@ -837,12 +837,8 @@ CREATE COLLATION german (provider = libc, locale = 'de_DE');
and <ulink url="https://tools.ietf.org/html/bcp47">BCP 47</ulink> for
details. The list of possible collation types (<literal>co</literal>
subtag) can be found in
- the <ulink url="http://www.unicode.org/repos/cldr/trunk/common/bcp47/collation.xml">CLDR
+ the <ulink url="https://github.com/unicode-org/cldr/blob/master/common/bcp47/collation.xml">CLDR
repository</ulink>.
- The <ulink url="https://ssl.icu-project.org/icu-bin/locexp">ICU Locale
- Explorer</ulink> can be used to check the details of a particular locale
- definition. The examples using the <literal>k*</literal> subtags require
- at least ICU version 54.
</para>
<para>
