Incorrect docs for source freshness in 1.7

[b-per]

Contributions

• I have read the contribution docs, and understand what's expected of me.

Link to the page on docs.getdbt.com requiring updates

https://docs.getdbt.com/reference/resource-properties/freshness

What part(s) of the page would you like to see updated?

The docs for 1.7 mention the following

Additionally, the loaded_at_field is required to calculate freshness for a table. If a loaded_at_field is not provided, then dbt will not calculate freshness for the table.

But since 1.7 loaded_at_field is not required anymore for all adapters (see here). I don't think that it is the case for all adapters though, and I don't know which adapters require or not loaded_at_field. The adapter team might be able to help.

Additional information

No response

[runleonarun]

Closing as duplicate of #4615