doc: filesystems : Fix typo in Documentations/filesystems

Correct spelling typo in Documentations/filesystems.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/filesystems/qnx6.txt b/Documentation/filesystems/qnx6.txt
index 99e9018..4086797 100644
--- a/Documentation/filesystems/qnx6.txt
+++ b/Documentation/filesystems/qnx6.txt
@@ -149,7 +149,7 @@
 ------------------
 
 The bitmap itself is divided into three parts.
-First the system area, that is split into two halfs.
+First the system area, that is split into two halves.
 Then userspace.
 
 The requirement for a static, fixed preallocated system area comes from how