Exception handling docs: Describe landingpad clauses' meanings in more detail
Exception handling docs: Describe landingpad clauses' meanings in more detail

The original text is very terse, so I've expanded on it.

Specifically, in the original text:

 * "The selector value is a positive number if the exception matched a
   type info" -- It wasn't clear that this meant "if the exception
   matched a 'catch' clause".

 * "If nothing is matched, the behavior of the program is
   `undefined`_."  -- It's actually implementation-defined in C++
   rather than undefined, as the new text explains.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@202209 91177308-0d34-0410-b5e6-96231b3b80d8

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