[Android] update docs

[kirklandsign]

You no longer need export FLATC_EXECUTABLE

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3285

• :page_facing_up: Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

:x: 2 New Failures

As of commit 6a5763e64d5ee75f41d6e3b0c10507f28452e69e with merge base f13a28e9eb4435c9172c853664fd70d4f73d56a2 ():

NEW FAILURES - The following jobs have failed:

• Android / test-llama-app / mobile-job (android) (gh) Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers
• Apple / upload-frameworks-ios (gh) Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers

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@kirklandsign has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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This pull request was exported from Phabricator. Differential Revision: D56507418

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@kirklandsign merged this pull request in pytorch/executorch@ce751fc351fa495101ef5a862fd305f7085ed2f2.