doc: imx: fix typo in imximage.txt

Signed-off-by: Michael Heimpold <mhei@heimpold.de>
Reviewed-by: Breno Lima <breno.lima@nxp.com>
diff --git a/doc/imx/mkimage/imximage.txt b/doc/imx/mkimage/imximage.txt
index 803682f..f2cf23c 100644
--- a/doc/imx/mkimage/imximage.txt
+++ b/doc/imx/mkimage/imximage.txt
@@ -175,7 +175,7 @@
 We have set 255 heads, 63 sector. We have to set the cylinder.
 The value to be set can be calculated with:
 
-	cilynder = <total size> / <heads> / <sectors> / <blocksize>
+	cylinder = <total size> / <heads> / <sectors> / <blocksize>
 
 in this example,
 	1981284352 / 255 / 63 / 512 = 239.x = 239