fix llama3 tutorial link

[kartikayk]

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[farshadghodsian]

Sorry to revive an old PR, but shouldn't this also be merged into Stable branch as most of the links to the tutorial pages including the post made in Reddit reference the stable branch which is still pointing to the wrong page for the Llama3 Tutorial: https://pytorch.org/torchtune/stable/#tutorials

[kartikayk]

@farshadghodsian stable points to the released packaged (v0.1.1). This change should be available in main (https://pytorch.org/torchtune/main/#tutorials) and will get merged with stable in the next package release. Sorry for the confusion on this.

cc: @joecummings