SDK tutorial doc update

[pytorchbot]

Differential Revision: D56453800

[pytorch-bot[bot]]

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:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3292

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As of commit 70d841d6b508ad02f41294a287b303bf446fd7b0 with merge base d3326a2073dee7baf78044fb3afd0772edbc616a (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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