git: calendar.1: Fix minor formatting issues

[Aaron LI]

commit 9c697e7d97d6baa26122897c91093020e3ba547b
Author: Aaron LI <aly at aaronly.me>
Date:   Fri Sep 11 23:02:26 2020 +0800

    calendar.1: Fix minor formatting issues
    
    * Fix markup of the '-s' flag
    * Use 'Cm' to itemize the values of the '-s' flag
    * Use 'Rs' and 'Re' macros to format the reference book
    * Update the usage text against the man page

Summary of changes:
 usr.bin/calendar/calendar.1.in | 38 ++++++++++++++++++++------------------
 usr.bin/calendar/calendar.c    |  5 ++---
 2 files changed, 22 insertions(+), 21 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/9c697e7d97d6baa26122897c91093020e3ba547b


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