Link in custom logs component points to the wrong docs

[dedemorton]

When searching the repo to update documentation links, I found a UI link here that needs to be removed or updated:

We don't know where this link appears in the UI (see Brandon's comment here), but a user trying to find info about adding YAML config options to their config is gonna be SOL because the topic doesn't talk about that at all.

The link needs to be removed or updated to point to a relevant topic.

Also, the link is hard coded, but should use the link service. See @lcawl's comment here.

@gchaps I'm wondering if we can do more to make sure that developers use the link service instead of hard coding links.

[elasticmachine]

Pinging @elastic/unified-observability (Team:Observability)

[lcawl]

IMO we cannot force teams to use the doc link service so the best option is to just remind them of the impact as we get nearer to our docs migration.