beep: Sort usage and man page options

Sort usage and man page options, mention possible minimum and maximum
values, fix punctuation marks, and cleanup the man page.

PR: 291092
Reviewed by: pauamma_gundo.com, christos
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D53827

(cherry picked from commit 55d98b024f25403f60efe04f90a391014b6bc388)