Update cheatsheets

tldr/linux/pct-exec

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pct exec
+
+> Launch a command inside a specified container.
+> More information: <https://pve.proxmox.com/pve-docs/pct.1.html>.
+
+- Launch a command in a container:
+
+`pct {{[ex|exec]}} {{100}} {{command}}`
+
+- Open a bash shell in a container:
+
+`pct {{[ex|exec]}} {{100}} bash`
+
+- Pass arguments to the command:
+
+`pct {{[ex|exec]}} {{100}} -- {{command}} {{arguments}}`