doc: typo fix addess -> address

Signed-off-by: Jelle van der Waa <jelle@vdwaa.nl>
diff --git a/doc/mkimage.1 b/doc/mkimage.1
index ffa7d60..e883f07 100644
--- a/doc/mkimage.1
+++ b/doc/mkimage.1
@@ -70,7 +70,7 @@
 Pass \-h as the compression to see the list of supported compression type.
 
 .TP
-.BI "\-a [" "load addess" "]"
+.BI "\-a [" "load address" "]"
 Set load address with a hex number.
 
 .TP