update typos

[Gasoonjia]

Summary: This diff solves part of Ali's comments in our tracer sheet (https://docs.google.com/spreadsheets/d/1PoJt7P9qMkFSaMmS9f9j8dVcTFhOmNHotQYpwBySydI/edit#gid=0). Specifically speaking：

"NanoGPT" -> "nanoGPT" "CoreML" -> "Core ML" "ExecuTorch Codebase" -> "ExecuTorch codebase" "Android Phone" -> "Android phone" "How to build Mobile Apps" -> "How to Build Mobile Apps"

also shorten the following two column names for avoid overlapping. "occurrences_in_delegated_graphs" -> "# in_delegated_graphs" "occurrences_in_non_delegated_graphs" -> # in_non_delegated_graphs

Differential Revision: D56513601

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3300

• :page_facing_up: Preview Python docs built from this PR

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:white_check_mark: No Failures

As of commit f256c628a16b19ee8cfb2238629daa80e63a204e with merge base 98a7e66023d6b62da2f8f65cbc9761e5dfe67184 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56513601

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D56513601

[facebook-github-bot]

This pull request has been merged in pytorch/executorch@b669056c1cff5f7fe3786df9e68a14447cd5410b.

[Gasoonjia]

@pytorchbot cherry-pick --onto release/0.2 -c docs

[pytorchbot]

Cherry picking #3300

The cherry pick PR is at https://github.com/pytorch/executorch/pull/3321

Details for Dev Infra team

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