Update cheatsheets

tldr/linux/write

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# write
+
+> Write a message on the terminal of a specified logged in user (`<Ctrl c>` to stop writing messages).
+> Use the `who` command to find out all terminal_ids of all active users active on the system. See also `mesg`.
+> More information: <https://manned.org/write>.
+
+- Send a message to a given user on a given terminal ID:
+
+`write {{username}} {{terminal_id}}`
+
+- Send message to "testuser" on terminal `/dev/tty/5`:
+
+`write {{testuser}} {{tty/5}}`
+
+- Send message to "johndoe" on pseudo terminal `/dev/pts/5`:
+
+`write {{johndoe}} {{pts/5}}`