SEH: Remove misleading text from one of the examples and minor fixes

[nir9]

Problem: The second example in the "Using an Exception Handler" page contains an irrelevant text talking about a return statement in the __try block, even though the example doesn't have a return in the try block. The sentence starts like this:

Also, use of the return statement in the __try block of an exception handler differs ...

The sentence is correct in general but is unrelated to the example so I think it could be removed.

Solution: Remove this sentence and also did a little more cleanup like moving the sentences talking about the filter expression to the top since they are related to 2 out of the 3 examples and not just to example 2

[prmerger-automator]

@nir9 : Thanks for your contribution! The author(s) have been notified to review your proposed change.