made config language slightly less scary
docs: fixed a typo and word-wrapped docs
errors: move status code filtering into urltils

The transaction naming logic and the error collector adding logic should
be the same here, so transactions with status codes that are errors but
are marked to be ignored aren't named as errors.
urltils: don't crash on missing parameters
docs: how to ignored status code
docs: updated for new version
release: published 0.12.1