Add tail --detect example to root help text

[dchaudhari7177]

Closes #41

Adds the missing line to the Examples: block in cmd/root.go, next to the existing tail example.

Verified from a build of this branch:

Examples:
  caddy-analyze /var/log/caddy/access.log
  caddy-analyze --detect /var/log/caddy/access.log
  caddy-analyze --ip 10.0.0.0/8 access.log
  caddy-analyze --5xx --no-bots access.log
  caddy-analyze tail --ip 192.168.1.100 docker://caddy
  caddy-analyze tail --detect docker://caddy
  caddy-analyze top ip --5xx -t 20 access.log
  caddy-analyze diff base.log current.log

Placed directly after the other tail line so the two tail forms read together, and it keeps the block's existing shape: simplest invocation first, then the flag variants.

go vet ./... clean, go test ./... all packages pass.