Refer to 'mask' instead of 'block' in documentation of Control.Exception

[Bas van Dijk]

Hello,

Attached is a small documentation fix for Control.Exception that
replaces references to the deprecated 'block' with the recommended
'mask' combinator.

There's one line in the section 'Applying mask to an exception
handler' that I'm not sure about what to do with:

"If you need to unblock asynchronous exceptions again in the exception
handler, just use 'unblock' as normal."

Do we really need to point users to a deprecated function?

Regards,

Bas
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