Improve x402 docs: add security note and fix code blocks#1381

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yasnazariel wants to merge 1 commit intobase:masterfrom

yasnazariel:patch-8

Commits on May 2, 2026

docs(x402): add security note for iframe messaging and fix code block formatting - add note about validating postMessage origin for security - replace invalid "bash Terminal" code blocks with stan…
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