[Docs]: Correct use of React and Codeact terminology

[Sergey-Zeltyn]

Type of Change

Fix (Typos, broken links, factual errors)

If "Other", please specify

No response

URL / Location (Optional)

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Description of the Issue

• we have React agent deployed at the repository that provides comparison baseline
• Appworld extension of this agent is actually Codeact, it is more advanced approach
• These details should me mentioned in documentation to avoid misunderstanding of experiments results

Current Text (Optional)

Suggested Text / Solution

Explain to user when React is run and when Codeact is run

Additional Context

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Quick Checks

• I have searched existing issues to avoid duplicates
• I have verified this issue exists in the latest documentation