fix: references in the cards

[evshank]

In the documentation, in the section how-abstract-works/evm-differences/overview.mdx, three links in the cards do not correspond to their names:

• gas-fees > best-practices
• nonces > contract-deployment
• libraries > contract-deployment

I changed them to match their names:

• gas-fees > gas-fees
• nonces > nonces
• libraries > libraries

[cursor]

PR Summary

Low Risk
Low risk documentation-only change that updates three internal links; main risk is introducing/retaining broken routes if the target pages don’t exist.

Overview
Fixes incorrect card URLs in how-abstract-works/evm-differences/overview.mdx so the Gas fees, Nonces, and Libraries cards link to their respective pages (/gas-fees, /nonces, /libraries) instead of unrelated routes.

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