Update cheatsheets

jcal

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# jcal
+
+> Display calendar information in the Jalali format, with the current day highlighted.
+> More information: <http://www.nongnu.org/jcal/>.
+
+- Display a calendar for the current month:
+
+`jcal`
+
+- Display the previous, current, and next months:
+
+`jcal -3`
+
+- Display a calendar for a specific year (4 digits):
+
+`jcal {{year}}`
+
+- Display a calendar for a specific month and year:
+
+`jcal {{year}} {{month}}`