doc: correct the spelling error for option -A

diff --git a/README.rst b/README.rst
index 50692e4..bc3f7fe 100644 (file)
--- a/README.rst
+++ b/README.rst
@@ -214,7 +214,7 @@ by all image types, see following table:
 +==================+==========================================================+
 | -o/--outdir      | specify directory where the images reside                |
 +------------------+----------------------------------------------------------+
-| -a/--arch        | specify repo architecture, like i586, armv7l, etc        |
+| -A/--arch        | specify repo architecture, like i586, armv7l, etc        |
 +------------------+----------------------------------------------------------+
 | -c/--config      | specify the custom configure file for mic                |
 +------------------+----------------------------------------------------------+