Update cheatsheets

tldr/linux/paccapability

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# paccapability
+
+> Query and display the capabilities supported by libalpm.
+> More information: <https://github.com/andrewgregory/pacutils/blob/master/doc/paccapability.pod>.
+
+- List all available capabilities:
+
+`paccapability`
+
+- Check for the specified capability:
+
+`paccapability {{nls|downloader|signatures}}`
+
+- Display help:
+
+`paccapability --help`
+
+- Display version:
+
+`paccapability --version`