Update agent.py typos gramatical errors

[noble-ch]

possabilities to possibilities
llm prompt to LLM prompt
comprehensive to comprehensible for clarity
other changes maintaining the original meaning while streamlining the sentence to be more understandable

Changes 🏗️

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For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
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• Create from scratch and execute an agent with at least 3 blocks
• Import an agent from file upload, and confirm it executes correctly
• Upload agent to marketplace
• Import an agent from marketplace and confirm it executes correctly
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For configuration changes:

• .env.example is updated or already compatible with my changes
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• Changing ports
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All committers have signed the CLA.

[qodo-merge-pro]

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[github-actions]

This PR targets the master branch but does not come from dev or a hotfix/* branch.

Automatically setting the base branch to dev.

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[github-actions]

This pull request has conflicts with the base branch, please resolve those so we can evaluate the pull request.