Remove reference to `component.UseLocalHostAsDefaultHost`

[mx-psi]

https://opentelemetry.io/docs/security/config-best-practices/#protect-against-denial-of-service-attacks mentions this feature gate that was removed in open-telemetry/opentelemetry-collector/pull/11412. We should remove any mention of it from the official docs.

[mx-psi]

Ah, actually it clearly says what versions this is available on, my bad 😅 I think there is nothing to do here