Fix broken links in cmd/cloudflared/*.go related to running tunnel as a service

[BWsix]

This PR updates 3 broken links to document run tunnel as a service.

The one in cmd/cloudflared/updater/update.go can be found by running cloudflared tunnel run:

> cloudflared tunnel run xxxx
2024-03-27T18:21:58Z INF Starting tunnel tunnelID=xxxx
2024-03-27T18:21:58Z INF Version 2024.3.0
2024-03-27T18:21:58Z INF GOOS: linux, GOVersion: go1.21.5-devel-cf, GoArch: amd64
2024-03-27T18:21:58Z INF Settings: xxxx
2024-03-27T18:21:58Z INF cloudflared will not automatically update when run from the shell. To enable auto-updates, run cloudflared as a service: https://developers.cloudflare.com/cloudflare-one/connections/connect-apps/run-tunnel/as-a-service/
^ the broken link is at the end of this line

The other two were found by manually grepping developers.cloudflare.com in the project.

[BWsix]

Hi chungthuang, I've updated the link you mentioned

[chungthuang]

Hi @BWsix thank you for fixing the links to the documentation. Can you rebase on the latest changes and we can merge it?

[povilasb]

Would be nice to have this merged 🙇‍♂️