Fix remove repl prompts

[Gyan-max]

This PR removes REPL-style prompts (>>>) from code blocks in the Qiskit documentation to improve readability and usability. The change ensures that users can copy-paste code snippets without modification.

Changes Made
✅ Replaced >>> with print( in all affected .rst and .md files.
✅ Updated files inside:

docs/guides/
docs/migration-guides/ ✅ Ensured that all modified examples remain correct and readable.
✅ Verified that the documentation builds correctly without errors.

@Eric-Arellano – Please review and suggest any improvements!

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[Gyan-max]

@Eric-Arellano Could you review this PR when you get a chance? It removes REPL-style prompts from docs to improve readability. Let me know if any changes are needed!

[Gyan-max]

@qiskit-bot The Lint check is still waiting for a status update. Is there anything I need to do, or should I wait for it to complete?