Fix broken links on the coreml tutorial page

[pytorchbot]

Differential Revision: D56487125

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3293

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As of commit 982724e3ffcfbbc5323d63f16b70ffca071a4aa5 with merge base d3326a2073dee7baf78044fb3afd0772edbc616a (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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