Ensure documentation always shows an action after a call specification

[blairconrad]

Specifying a method call or property get using an Expression has a sample block of code that does nothing with the return value of A.CallTo. The next paragraphs explain that you should use the return value, but a hasty reading may lead people to copy the example and not supply an action (behaviour or call assertion).

I think we should rework the documentation to include a better example. I've not yet searched, but the bad examples may appear elsewhere.

[blairconrad]

This change has been released as part of FakeItEasy 4.8.0.