Update part06.rst

If $request is not typed there is an error : Controller "render_template" requires that you provide a value for the "$request" argument (because there is no default value or because there is a non optional argument after this one).
bug #25 Update part06.rst (revollat)

This PR was merged into the master branch.

Discussion
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Update part06.rst

If $request is not typed there is an error : Controller "render_template" requires that you provide a value for the "$request" argument (because there is no default value or because there is a non optional argument after this one).

Commits
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a1336e0 Update part06.rst