[PATCH] typo fix in collationcmds.c: "if they are distinct"

Hello,

just a quick patch for a single-letter typo in a comment
in src/backend/commands/collationcmds.c
...
      * set of language+region combinations, whereas the latter only returns
-    * language+region combinations of they are distinct from the language's
+    * language+region combinations if they are distinct from the language's
      * base collation.  So there might not be a de-DE or en-GB, which 
would be
...
(please see the attached patch).

-- 
Anton Voloshin
Postgres Professional: https://www.postgrespro.com
Russian Postgres Company