Documentation/filesystems/vfat.txt: fix a remark that implies UCS2

All non-historic operating systems support the full range of Unicode here,
thus you can make filenames for example in Gothic (πŒΌπŒ΄π‰π…), the other Gothic
(π“‚β„―β„΄π“Œ) or the third Gothic (π—†π–Ύπ—ˆπ—), or declare something as πŸ’©.

Characters above U+FFFF are encoded on four bytes.

Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/filesystems/vfat.txt b/Documentation/filesystems/vfat.txt
index cf51360..9103129 100644
--- a/Documentation/filesystems/vfat.txt
+++ b/Documentation/filesystems/vfat.txt
@@ -344,4 +344,4 @@
 	   characters in the final slot are set to Unicode 0xFFFF.
 
 Finally, note that the extended name is stored in Unicode.  Each Unicode
-character takes two bytes.
+character takes either two or four bytes, UTF-16LE encoded.