wic: Fix typo in help screen.

This was overlooked when f6a064d969f4149b was merged.

(From OE-Core rev: 29a209822488ab687abdb1ceffdd9c7af5b3db68)

Signed-off-by: Kristian Amlie <kristian.amlie@mender.io>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/wic/help.py

@@ -721,7 +721,7 @@ DESCRIPTION
                      bootloaders.
 
          --exclude-path: This option is specific to wic. It excludes the given
-                         absolute path from the resulting image. If the path
+                         relative path from the resulting image. If the path
                          ends with a slash, only the content of the directory
                          is omitted, not the directory itself. This option only
                          has an effect with the rootfs source plugin.