[11.x] docs(queue): Add docs for forcing the default connection

[victorelec14]

Added documentation to specify that the queue:work command can be forced to use the default connection. Two examples were provided: one using null and another using an empty string.

[taylorotwell]

I don't see why we would need to document this? Just don't pass a connection at all.

[victorelec14]

Hi @taylorotwell ,

I think it would be a good idea to document this. On some deployment websites (or in scripts), there are times when the "connection name" is a required field and cannot be left empty. Because of this, some people create a new connection without realizing that they can enter "null" as the connection name to use the default value.

For example, in the case of Ploi, it doesn’t allow you to leave it empty, but very few people know that entering "null" will select the default connection. Even the developer of Ploi wasn’t aware of this until I opened a support ticket.

This is not the first time I have seen this issue. It also happens in scripts that pass an empty string "" or use different commands depending on whether there is a value or not.

I think it would be good to reconsider this.

Thank you.

Docs: https://laravel.com/docs/11.x/queues#specifying-the-connection-queue