Docs: testing + debug mode

[romuald]

Summary

As a new litestar user, I've just started looking at documentation to test my application.

With the default example, un-handled errors are simply turning up as 500 internal server error without much to use.

Simply setting app.debug = True inside the test module is enough to have a proper traceback.

Would it be possible to add this line on the first examples? Maybe there is a better way?

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Looking up a the source for AsyncTestClient I see that there is a raise_server_exceptions option (in my case it is set to True, the default)

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