docs: add FAQ entry for preVerificationGas errors

[devin-ai-integration]

Add FAQ entry for preVerificationGas errors

This PR adds a new FAQ entry explaining how to resolve preVerificationGas is not enough errors, which commonly occur during gas estimation.

Changes

• Added new FAQ section under "Getting preVerificationGas is not enough errors?"
• Included detailed explanation of error causes
• Added code example showing how to add gas buffers
• Provided guidance on dummy signature requirements

Testing

• ✅ Verified content grammar and clarity
• ✅ Tested build locally with pnpm build - completed successfully
• ✅ Followed existing FAQ format and structure

Link to Devin run: https://app.devin.ai/sessions/165f9a9c9e6b430fae901443c038b236

[devin-ai-integration]

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 16, 2025 3:43pm