doc: Improve ICU external link

It previously pointed to the collation API documentation, which our
users don't need, but the containing chapter seems useful.

diff --git a/doc/src/sgml/charset.sgml b/doc/src/sgml/charset.sgml
index 22721b105ff4d2a114e1c1465c8d9d18193c07f2..dd092fddd6108f8ada9ee2e96f3dfc5738656e48 100644 (file)
--- a/doc/src/sgml/charset.sgml
+++ b/doc/src/sgml/charset.sgml
@@ -1562,7 +1562,7 @@ SELECT 'x-y' = 'x_y' COLLATE level4; -- false
      </listitem>
      <listitem>
       <para>
-       <ulink url="https://unicode-org.github.io/icu/userguide/collation/api.html"></ulink>
+       <ulink url="https://unicode-org.github.io/icu/userguide/collation/"></ulink>
       </para>
      </listitem>
     </itemizedlist>