kmemtrace: Fix typos in documentation.

Corrected the ABI description and the kmemtrace usage guide. Thanks to
Randy Dunlap for noticing these errors.
Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>

Documentation/ABI/testing/debugfs-kmemtrace

@@ -63,7 +63,7 @@ Adding new data to the packet (features) is done at the end of the mandatory
 data:
 	Feature size	(2 byte)
 	Feature ID	(1 byte)
-	Feature data	(Feature size - 4 bytes)
+	Feature data	(Feature size - 3 bytes)
 
 
 Users:

Documentation/vm/kmemtrace.txt

@@ -61,7 +61,7 @@ III. Quick usage guide
 ======================
 
 1) Get a kernel that supports kmemtrace and build it accordingly (i.e. enable
-CONFIG_KMEMTRACE and CONFIG_DEFAULT_ENABLED).
+CONFIG_KMEMTRACE and CONFIG_KMEMTRACE_DEFAULT_ENABLED).
 
 2) Get the userspace tool and build it:
 $ git-clone git://repo.or.cz/kmemtrace-user.git		# current repository