Update cheatsheets

linux/pstree

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pstree
+
+> A convenient tool to show running processes as a tree.
+> More information: <https://manned.org/pstree>.
+
+- Display a tree of processes:
+
+`pstree`
+
+- Display a tree of processes with PIDs:
+
+`pstree -p`
+
+- Display all process trees rooted at processes owned by specified user:
+
+`pstree {{user}}`