Adjust async_load_platform comment to remove dead lock reference

[bdraco]

Proposed change

Its likely the deadlock (#4108) here has been fixed for a long time, and since platforms load in tasks

core/homeassistant/helpers/entity_component.py

Line 151 in 69a6e9f

self.hass.async_create_task(

, I can no longer come up with a case where it would deadlock.

However we should still do these in a task because it has to wait for base components if they are not loaded yet.

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[bdraco]

#114700 (comment)

Mailbox can still deadlock

[bdraco]

#114774