Add DI config example for failureHandler

[rossaddison]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌

Docs only, no code changes.

failureHandler is currently shown only via manual construction
(new CsrfTokenMiddleware(...)). A couple of lines down, withSafeMethods()
and withHeaderName() get a DI container example too. This adds the same
kind of example for failureHandler, since that's how most Yii3 apps
actually wire it up.

Happy to adjust wording/formatting to match your preference.

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