tailscale: add debug example

[mfrw]

Signed-off-by: Muhammad Falak R Wani [email protected]

• [x] The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• [x] The page(s) have at most 8 examples.
• [x] The page description(s) have links to documentation or a homepage.
• [x] The page(s) follow the content guidelines.
• [x] The PR title conforms to the recommended templates.
• Version of the command being documented (if known):

PS: Instead of having help subcommand which the tailscale cli anyway suggests, document the hidden debug subcommand which is very useful to get more details about a running tailscale instance. Reference: cmd/tailscale/cli/cli.go

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