imx: s/docs\/README.imximage/doc\/README.imximage/g

Fixed typo for doc/README.imximage on respective imximage.cfg files.

Cc: Tom Rini <trini@konsulko.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/board/freescale/s32v234evb/s32v234evb.cfg b/board/freescale/s32v234evb/s32v234evb.cfg
index 6017a40..6449ef2 100644
--- a/board/freescale/s32v234evb/s32v234evb.cfg
+++ b/board/freescale/s32v234evb/s32v234evb.cfg
@@ -5,7 +5,7 @@
  */
 
 /*
- * Refer docs/README.imxmage for more details about how-to configure
+ * Refer doc/README.imximage for more details about how-to configure
  * and create imximage boot image
  *
  * The syntax is taken as close as possible with the kwbimage