Fix example for 'test-submit rule' in Prolog cookbook

Since commit b1f730b89458d9d094bc93f3d328ad744c39bbb5 it is
'test-submit rule' and not anymore 'test-submit-rule'.

Change-Id: I4c32893afa1410af5347a8b659c5811aac218f63
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
1 file changed