Documentation in 1.1 release of \texdimenbothbpmm and \texdimenbothmmbp use "smaller than" but intend "not exceeding"

I thought I had fixed this already (in b93ed3c5, for 1.0 release) but I must have been grepping for `smaller than` and overlooked `smaller (in absolute value) than`.  ... too late for 1.1 already released. It seems one can check typos only after releases, what a curse.