Update description of the `logger-name` hint

[philwebb]

Logging groups are currently configured using logging.level.<group>. Although nice and simple, It's possible that the group name could clash with an existing logger. We should review if a distinct namespace might work better.

One idea would be:

logging.group.<name>.level=...
logging.group.<name>.loggers=...

Unfortunately it's hard to get good meta-data for that.

Another option would be:

logging.group.level.<name>=...
logging.group.logger.<name>=...

That, feels a little backward.

[philwebb]

There are also some IDE considerations to take into account. Existing auto-completion will not account for our provided names or those defined by the user.

[snicoll]

We've discussed this and the current situation is OK. We do have an explicit logger-name hint already so we should update the semantic of the hint to account for the group and let IDE developers know.

[snicoll]

I'd like to update the doc for logger-name as part of of this issue and create the relevant issues for the IDE support.