Document rule set defaults

[layday]

I've noticed recently that reportUnusedCallResult is not controlled by typeCheckingMode; that is, setting the latter to "strict" will not set the former to true. I now wonder if this is the only diagnostic-category setting which exhibits this behaviour or if there are other settings which do not follow typeCheckingMode. It might be useful to document the settings' values for each rule set.

[erictraut]

I've added a table to the documentation.