Update cheatsheets

linux/compose

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# compose
+
+> An alias to a `run-mailcap`'s action compose.
+> Originally `run-mailcap` is used to mime-type/file.
+> More information: <https://manned.org/compose>.
+
+- Compose action can be used to compose any existing file or new on default mailcap edit tool:
+
+`compose {{filename}}`
+
+- With `run-mailcap`:
+
+`run-mailcap --action=compose {{filename}}`