Update cheatsheets

gcal

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gcal
+
+> Displays calendar.
+> More information: <https://www.gnu.org/software/gcal>.
+
+- Display calendar for the current month:
+
+`gcal`
+
+- Display calendar for the month of February of the year 2010:
+
+`gcal {{2}} {{2010}}`
+
+- Provide calendar sheet with week numbers:
+
+`gcal --with-week-number`
+
+- Change starting day of week to 1st day of the week (Monday):
+
+`gcal --starting-day={{1}}`
+
+- Display the previous, current and next month surrounding today:
+
+`gcal .`