Update cheatsheets

tldr/linux/paclock

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# paclock
+
+> Lock/unlock the libalpm database (used by `pacman`) to prevent or allow simultaneous package management operations.
+> More information: <https://github.com/andrewgregory/pacutils/blob/master/doc/paclock.pod>.
+
+- Lock the database:
+
+`paclock`
+
+- Write the lock file path to `stdout` (without locking the database):
+
+`paclock --print`
+
+- Unlock the database:
+
+`paclock --unlock`
+
+- Display help:
+
+`paclock --help`
+
+- Display version:
+
+`paclock --version`