tutorial/hello-tokio: Remove unnecessary mut
#833
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the runtime instance doesn't need to be a mutable. I also modify text around since the code is not a expanded result of the async main function.
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Motivation
The runtime instance in the sample code doesn't need to be a mutable. It may cause a confusion.
Change
transformedmeans that the code is the result of macro expansion, but actually the code is just a (almost) functionally equivalent with the async code.