Fix typos in /Documentation : 'U-Z'

This patch fixes typos in various Documentation txts. The patch addresses some
+words starting with the letters 'U-Z'.

Looks like I made it through the alphabet...just in time to start over again
+too!  Maybe I can fit more profound fixes into the next round...?  Time will
+tell. :)

Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

Documentation/filesystems/hpfs.txt

@@ -274,7 +274,7 @@ History
      Fixed race-condition in buffer code - it is in all filesystems in Linux;
         when reading device (cat /dev/hda) while creating files on it, files
         could be damaged
-2.02 Woraround for bug in breada in Linux. breada could cause accesses beyond
+2.02 Workaround for bug in breada in Linux. breada could cause accesses beyond
         end of partition
 2.03 Char, block devices and pipes are correctly created
      Fixed non-crashing race in unlink (Alexander Viro)