Updated Android doc with proper 1.0.0 backend links to executorch

[psiddh]

Summary

[PLEASE REMOVE] See CONTRIBUTING.md's Pull Requests for ExecuTorch PR guidelines.

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Test plan

[PLEASE REMOVE] How did you test this PR? Please write down any manual commands you used and note down tests that you have written if applicable.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15266

• 📄 Preview Python docs built from this PR

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❗ 2 Active SEVs

There are 2 currently active SEVs. If your PR is affected, please view them below:

• [ROCm][CI] Machines under the label linux.rocm.gpu.2 are undergoing maintenance.
• AWS was down, GHA infrastructure effected / recovering

❌ 1 New Failure, 25 Pending

As of commit 46f74eb with merge base 4f38afb ():

NEW FAILURE - The following job has failed:

• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t c1b31c208f8e06042419937ca6513ddc463dc7c05c4cc9fcfd476f9b2e41c17c /exec failed with exit code 1

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