Update cheatsheets

tldr/linux/away

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# away
+
+> Locks terminal with an away message.
+> More information: <https://manned.org/away>.
+
+- Lock terminal and set away message:
+
+`away {{message}}`
+
+- Lock terminal and enable mail check:
+
+`away {{[-c|--mail]}} {{message}}`
+
+- Lock terminal and disable mail check:
+
+`away {{[-C|--nomail]}} {{message}}`
+
+- Lock terminal and sleep background tasks for number of seconds:
+
+`away {{[-t|--time]}} {{seconds}} {{message}}`
+
+- Lock terminal and check mail if at least one inbox hasn't received new mail:
+
+`away {{[-p|--persist]}} {{message}}`
+
+- Lock terminal and check mail until at least one inbox has received new mail:
+
+`away {{[-P|--nopersist]}} {{message}}`
+
+- Display help:
+
+`away {{[-h|--help]}}`
+
+- Display version:
+
+`away {{[-v|--version]}}`