Added documentation for the `major-version-bump-message` configuration option.
Added documentation for the `major-version-bump-message` configuration option.

dazinator/GitVersion,dpurge/GitVersion,DanielRose/GitVersion,asbjornu/GitVersion,ermshiperete/GitVersion,DanielRose/GitVersion,ParticularLabs/GitVersion,Philo/GitVersion,onovotny/GitVersion,dazinator/GitVersion,pascalberger/GitVersion,JakeGinnivan/GitVersion,gep13/GitVersion,ermshiperete/GitVersion,pascalberger/GitVersion,ParticularLabs/GitVersion,Philo/GitVersion,ermshiperete/GitVersion,pascalberger/GitVersion,ermshiperete/GitVersion,asbjornu/GitVersion,GitTools/GitVersion,JakeGinnivan/GitVersion,onovotny/GitVersion,FireHost/GitVersion,JakeGinnivan/GitVersion,gep13/GitVersion,onovotny/GitVersion,FireHost/GitVersion,JakeGinnivan/GitVersion,dpurge/GitVersion,dpurge/GitVersion,DanielRose/GitVersion,GitTools/GitVersion,dpurge/GitVersion