Previously, `fedrq` was only mentioned in the Utilities page. On the
other hand, Package Update Guide did not have anything about checking
for affected dependents. Move `fedrq` usage instructions to that page,
so it is part of a document describing a full workflow, rather than
just in a list of random tools.
The new _Finding dependents_ section in Package Update Guide is quite
short for such a complicated topic. It can be extended later. The
purpose of this change is not to exhaustively cover that topic. The
purpose is just to move the existing coverage of `fedrq` abd checking
for affected packages.
Pull requests are an important aspect of how Fedora packaging works,
and, crucially, the easiest way for new contributors to get started.
Document a way how they can be used.
Fixes#66
The most common warning is about redirects. Such links are replaced
with direct links. In some cases better syntax for the same URL is
used, and in a single case the link target seems to be completely gone,
so the link is just removed.
