Update cheatsheets

tldr/linux/tzselect

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# tzselect
+
+> Interactively select timezone.
+> Note: this program doesn't actually set the timezone.
+> More information: <https://manned.org/tzselect>.
+
+- Open the interactive menu for timezone selection and print the selected timezone to `stdout`:
+
+`tzselect`
+
+- Ask for nearest timezone to coordinates in ISO 6709 notation:
+
+`tzselect -c {{coordinates}}`