Update cheatsheets

tldr/virt-viewer

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# virt-viewer
+
+> Minimal graphical interface for a virtual machine (VM).
+> Note: `domain` refers to the name, UUID, or ID for the existing VMs.
+> See also: `virsh`.
+> More information: <https://manned.org/virt-viewer>.
+
+- Launch `virt-viewer` with a prompt to select running virtual machines:
+
+`virt-viewer`
+
+- Launch `virt-viewer` for a specific virtual machine by ID, UUID, or name:
+
+`virt-viewer "{{domain}}"`
+
+- Wait for a virtual machine to start and automatically reconnect if it shutdown and restarts:
+
+`virt-viewer --reconnect --wait "{{domain}}"`
+
+- Connect to a specific remote virtual machine over TLS:
+
+`virt-viewer --connect "xen//{{url}}" "{{domain}}"`
+
+- Connect to a specific remote virtual machine over SSH:
+
+`virt-viewer --connect "qemu+ssh//{{username}}@{{url}}/system" "{{domain}}"`