ExceptionHook: Document the behavior when multiple exception hooks are registered
ExceptionHook: Document the behavior when multiple exception hooks are registered

Signed-off-by: Edwin Kempin <d43fb6c98c97e553b671ed9a9318100f1de386e7@google.com>
Change-Id: Ic653584f79cf10ab5e7c4b573fe575dc975be117

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