webos_enhanced_submissions: Clarify submission tag convention

Make it explicit that only components that have been branched can have
submission tags that contain more than single integer.

Open-webOS-DCO-1.0-Signed-off-by: Herb Kuta <herb.kuta@palm.com>
Change-Id: I8bfaab6e90f308ece8306402deb643a05b8456f6
Reviewed-on: http://g2g.palm.com/1174
Tested-by: Herb Kuta <herb.kuta@palm.com>
Reviewed-by: Build Verification
Reviewed-by: Steve Winston <steve.winston@palm.com>
Tested-by: Steve Winston <steve.winston@palm.com>
Reviewed-by: Susan Montooth <susan.montooth@palm.com>