update documentation ( AutoTabsRouter.pageView )

[Kevin Simon]

Thanks for the great router!! 👍 🚀

While building a new Application, I tried to use the nested navigation with a custom sidebar but couldnt handle to run the example. The usage of AutoTabsRouter.pageViewis unclear, because inside the builder there is notabsRouter` available.

thank you in advance! 😃

[github-actions]

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