Update cheatsheets

calendar

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# calendar
+
+> Display upcoming events from a calendar file.
+> More information: <https://www.commandlinux.com/man-page/man1/calendar.1.html>.
+
+- Show events for today and tomorrow (or the weekend on Friday) from the default calendar:
+
+`calendar`
+
+- Look [A]head, showing events for the next 30 days:
+
+`calendar -A {{30}}`
+
+- Look [B]ack, showing events for the previous 7 days:
+
+`calendar -B {{7}}`
+
+- Show events from a custom calendar [f]ile:
+
+`calendar -f {{path/to/file}}`