Make the default log behavior really not logging debug message

[michelsalib]

I think the documented behavior makes more sense, so it should be respected.

We keep the behavior to avoid BC, I am just updating the doc.

[petebacondarwin]

I am afraid that the documentation was committed after the code, so it is arguably the documentation that is wrong.
Certainly it is easier to change the documentation to be accurate without potentially breaking people's applications.
You do have a point, though, that debug message should probably be turned off by default.

[michelsalib]

I just fixed the PR to only change the documentation (this following the current code behavior that logs debug messages). I also squashed.

[michelsalib]

ping @petebacondarwin.

[petebacondarwin]

@michelsalib - thanks for updating. I think the new change actually breaks the sentence. But I will fix it up and merge.