Truncate id to <=44 characters

This is the original DocBook SGML limit, but apparently most
installations have changed it or ignore it, which is why few people
have run into this problem.

pointed out by Brendan Jurd

doc/src/sgml/information_schema.sgml

@@ -825,7 +825,7 @@
   </table>
  </sect1>
 
- <sect1 id="infoschema-collation-character-set-applicability">
+ <sect1 id="infoschema-collation-character-set-applicab"> <!-- max 44 characters -->
   <title><literal>collation_character_set_applicability</literal></title>
 
   <para>