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 only (missed in previous commit)
Branch
------
REL_10_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/9cb9c91460c424bb5b856e3e09b59e55854a0293
Modified Files
--------------
doc/src/sgml/charset.sgml | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)