docs: add a dedicated section to desktop LDAP discovery

[zmb3]

Closes #51485

[github-actions]

Amplify deployment status

Branch	Commit	Job ID	Status	Preview	Updated (UTC)
zmb3/docs-ldap-discovery	HEAD	1	✅SUCCEED	zmb3-docs-ldap-discovery	2025-01-27 19:52:00

[ravicious]

Nice, thanks for a quick PR.

[ptgott]

Would it make sense to add this as a guide to the auto-discovery section (https://goteleport.com/docs/enroll-resources/auto-discovery/)? We could also keep this section as part of the AD how-to guide and add a link to it from the Auto-Discovery section landing page. What do you think would be the most discoverable?

Edit: in terms of traffic, the enroll-resources/desktop-access section gets more, so it might make sense to keep this info in the how-to guide and add a link.

[zmb3]

The auto discovery guide is really focused on teleports discovery service. I think I'd like to keep this here because ldap discovery runs in the windows desktop service, not the discovery service.

[ptgott]

I would add one sentence to the first paragraph of this section explaining that the Desktop Service is what discovers desktops.

[public-teleport-github-review-bot]

@zmb3 See the table below for backport results.

Branch	Result
branch/v15	Failed
branch/v16	Failed
branch/v17	Create PR