[docs] [issue37891] Exceptions tutorial page does not mention raise from

Srinivas Nyayapati shireenrao@gmail.com added the comment:

Here is my first pass at this. I propose the following sentence be added at the end section 8.4:

If you need to track related exceptions (exceptions during exception handling), you should use exception chaining. You can chain exceptions by using the ``from`` clause. Just raise a new exception class or instance from an existing exception. The existing exception will be set as the cause for the new exception.

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