Fix 'update route' vty commandOptional param marks in VTY command descriptions are only supportedper token, spanning a list of params is not supported and failsmatching.Related: SYS#7112(cherry picked from commit 5361f273e1cad25505e490d89d4b12d990cba557)Change-Id: I91aa6031ca64841e63eb034fd2be2b3b2818fb53