wandboard: fix typo in README

Fix typo in wandboard README file.

Signed-off-by: Luka Perkov <luka@openwrt.org>
diff --git a/board/wandboard/README b/board/wandboard/README
index e0b0b33..ce83bbe 100644
--- a/board/wandboard/README
+++ b/board/wandboard/README
@@ -14,12 +14,12 @@
 
 To build U-Boot for the Wandboard Dual Lite version:
 
-$ make wanboard_dl_config
+$ make wandboard_dl_config
 $ make
 
 To build U-Boot for the Wandboard Solo version:
 
-$ make wanboard_solo_config
+$ make wandboard_solo_config
 $ make
 
 Flashing U-boot into the SD card