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Summary: * Reformat Control.Monad.mfilter docs The formatting was bad, with everything running together, and a paranthesis was missing. Now the examples and relation between `filter` and `mfilter` are typeset as code blocks instead of inline. * Add example to Control.Monad.join docs The example is using `join . atomically` to run IO actions computed by STM transactions. I couldn't figure out how to link to the STM docs in `Control.Monad.STM`, because that module comes from the `stm` package, not from `base`, even though `stm` is also part of the GHC source tree. So, instead I linked to the STM docs in `GHC.Conc`, which seems inferior to linking to `Control.Monad.STM`, but better than having no links at all. * Add example to Control.Monad.forever docs The example is a simple TCP echo server. To make the uses of `forever` stand out in the example code, I only link to the non-`forever` functions (e.g. `forkFinally`) in the import lists. Reviewers: bgamari, hvr Subscribers: rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4259
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