Remove std::old_io from Standard Input in tutorial book#23800

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Commits on Mar 28, 2015

Replaced old_io with io in standard input tutorial page
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Small type: "oio" -> "io"
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Got rid of corefn. It does not compile.
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A few more errors found from reading everything over a few times and making sure all code examples compile/run
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Quick explanation of the mutable reference since it hasn't been introduced yet.
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