* doc/misc/erc.texi (Sample Configuration): Move `erc-modules' twiddling
from a `use-package' :config section to a :custom section. In the past,
this would sometimes provoke module-loading issues, but it seems to work
fine on Emacs 30, even with repeated eval'ing of the `use-package' form.
This sample config is meant for users running the latest release anyhow.
Also add a new `use-package' block for `erc-match' showing how to
customize a face using inheritance. Add a corresponding section further
down showing the same via Customize.
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