Adjust comments about collate.linux.utf8 regression test.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 1abd146dddc1dc5efff5ccac065c460108acbaa9
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2011-04-23T16:51:47Z
Releases: 9.1.0
Adjust comments about collate.linux.utf8 regression test.

This test should now work in any database with UTF8 encoding, regardless
of the database's default locale.  The former restriction was really
"doesn't work if default locale is C", and that was because of not handling
mbstowcs/wcstombs correctly.

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