review verbosity of output in docs

[nohwnd]

These are all part of Detailed+ verbosity output: Filters, running in file xyz, blocks and successful tests.

We should add a comment like # Output level: Detailed in examples it is essential, like the Filter-lines in this one.

Originally posted by @fflaten in #386 (comment)

[nohwnd]

dupe of #394, was too eager with creating it.