ci(static-checks): update the notification message for newly added files

Improving the existing message to provide a better clarity to the patch
owners on the action to be taken while introducing new source files.

Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Change-Id: I802defbe84ab96ba4a71547aecd9c6273796b58b
1 file changed