Update introduction.rst

Got the error `Can't find import Effects` when attempting this part of the tutorial. Managed to solve it after finding issue #1524, but would have been faster if this flag was mentioned in the tutorial.
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@ -17,7 +17,8 @@ exceptions, and verified resource management.
This tutorial assumes familiarity with pure programming in Idris, This tutorial assumes familiarity with pure programming in Idris,
as described in Sections 16 of the main tutorial [1]_. The examples as described in Sections 16 of the main tutorial [1]_. The examples
presented are tested with Idris and can be found in the presented are tested with Idris and can be found in the
examples directory of the Idris repository. examples directory of the Idris repository. The ``-p effects`` flag
is needed when starting Idris.
Consider, for example, the following introductory function which Consider, for example, the following introductory function which
illustrates the kind of properties which can be expressed in the type illustrates the kind of properties which can be expressed in the type