libsa: smbios: style(9): Entry point parsing comments
    
    Move the comments so that lines stay of reasonable length.
    
    Remove comments that state the obvious.
    
    Reviewed by:    markj
    MFC after:      2 weeks
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D49280
    
    (cherry picked from commit a609592ddcdf4e33a5126ffcdd12e6a609078d4c)