[PATCH] Docs update: small spelling, formating etc fixes for filesystems/ext3.txt

Spelling fixes, formating changes and corrections for
 Documentation/filesystems/ext3.txt
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>