kmswebrtcendpoint: fix turn-url description
kmswebrtcendpoint: fix turn-url description

Change-Id: Ieb7a67319c7e793eedc4a74bfbddb655044016f6

TribeMedia/kms-elements,Kurento/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,Kurento/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,Kurento/kms-elements,shelsonjava/kms-elements