docs: document devnet simulation false-positive troubleshooting (#489)

[akshitj11]

Add FAQ explaining when Phantom's devnet simulation warning is a false
positive, with local verification steps and signTransaction guidance.

Fixes #489

Summary by CodeRabbit

Documentation

• Enhanced documentation on alternative transaction signing methods, explaining pre-sign simulation behavior and RPC context handling
• New devnet troubleshooting guide addressing "transaction reverted during simulation" warnings, complete with local verification techniques, false-positive identification checklist, and escalation recommendations

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7939fe76-0fc1-462f-bde2-3fcf41f86318

📥 Commits

Reviewing files that changed from the base of the PR and between f1e613e and abaa108.

📒 Files selected for processing (2)

• getting-started-with-solana/sending-a-transaction.md
• resources/faq.md

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📝 Walkthrough

Walkthrough

This PR adds documentation explaining Phantom's devnet "transaction reverted during simulation" false-positive warning. Updates span tutorial guidance on signing methods and a comprehensive FAQ entry covering problem diagnosis, verification techniques, and escalation steps.

Changes

Devnet Simulation Warning Guidance

Layer / File(s)	Summary
Tutorial guidance on signing methods and devnet simulation behavior getting-started-with-solana/sending-a-transaction.md	The "Other Signing Methods" section clarifies that signAndSendTransaction keeps simulation and submission in the same RPC context to reduce misleading warnings. The "Signing a Transaction (Without Sending)" section adds a devnet-specific warning explaining that signTransaction triggers pre-sign simulation and may show false "reverted during simulation" messages, with instructions to locally simulate and verify Testnet Mode alignment.
FAQ explanation and diagnostic framework for the warning resources/faq.md	A new FAQ section explains the "transaction reverted during simulation" warning message, why it occurs even when transactions later succeed on-chain, and the simulation versus broadcast pipeline that leads to false positives. A related warnings table and checklist distinguish the simulation revert from other Phantom approval warnings and help determine whether a warning is a false positive or a real failure.
FAQ verification guidance and escalation steps resources/faq.md	Added sections for local transaction verification (including a JavaScript helper using simulateTransaction with blockhash refresh), commitment-alignment rules for dapp RPC integration, and escalation criteria for persistent failures, real errors, and when to seek help via GitHub issues or the Phantom developer Discord.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs: document devnet simulation false-positive troubleshooting' directly and accurately summarizes the main change: adding documentation about devnet simulation false-positive warnings.
Linked Issues check	✅ Passed	The PR directly addresses issue #489 by adding FAQ documentation explaining the devnet simulation false-positive warning, providing verification steps, and offering guidance for dapps using signTransaction.
Out of Scope Changes check	✅ Passed	All changes are documentation-only and directly related to addressing issue #489's requirements: explaining false-positives, providing troubleshooting steps, and offering implementation guidance.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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