Documentation: Fix multiple typo in Documentation

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/devicetree/booting-without-of.txt b/Documentation/devicetree/booting-without-of.txt
index 7c1329d..da0bfeb 100644
--- a/Documentation/devicetree/booting-without-of.txt
+++ b/Documentation/devicetree/booting-without-of.txt
@@ -169,7 +169,7 @@
 
         b) Entry with a flattened device-tree block.  Firmware loads the
         physical address of the flattened device tree block (dtb) into r2,
-        r1 is not used, but it is considered good practise to use a valid
+        r1 is not used, but it is considered good practice to use a valid
         machine number as described in Documentation/arm/Booting.
 
                 r0 : 0