Doc fixes in Control.Exception

[Bas van Dijk]

I also noticed some dead links to 'BlockedOnDeadMVar' and
'BlockedIndefinitely' in the documentation of 'forkIO':

http://haskell.org/ghc/docs/latest/html/libraries/base-4.2.0.0/Control-Concurrent.html#v%3AforkIO

I see 'BlockedOnDeadMVar' got renamed to 'BlockedIndefinitelyOnMVar'
and 'BlockedIndefinitely' got renamed to 'BlockedIndefinitelyOnSTM'.

The attached patch fixes it.

regards,

Bas
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