Cosmetic doc typo fixes to the kwbimage feature docs

Signed-off-by: Karl O. Pinc <kop@meme.com>
diff --git a/doc/README.kwbimage b/doc/README.kwbimage
index 6dd942f..7f15e6d 100644
--- a/doc/README.kwbimage
+++ b/doc/README.kwbimage
@@ -25,7 +25,7 @@
 		-T kwbimage -a 0x00600000 -e 0x00600000 \
 		-d u-boot.bin u-boot.kwb
 
-kwimage support available with mkimage utility will generate kirkwood boot
+kwbimage support available with mkimage utility will generate kirkwood boot
 image that can be flashed on the board NAND/SPI flash
 
 Board specific configuration file specifications: