Fix typos and improve wording in README.md

[parthj732005]

Requesting Merging

Description

This PR fixes typos and improves wording in the README.md for clarity and consistency.

Type of Change

• DOCUMENTATION & DEVOPS

Test Environment

• No code changes, only documentation updates.

Major Changes

• Corrected "cli" → "CLI"
• Fixed grammar: "at your Python environment" → "in your Python environment".
• Updated "All FastAPI-fastkit templates are based on..." → "Templates follow Python standards and common FastAPI patterns."
• Standardized reference: "FastAPI-cli package" → "FastAPI CLI package".
• Changed "Prettier CLI outputs" → "Prettier CLI output".

Screenshots (optional)

N/A

Etc

Improves readability and ensures consistency with FastAPI’s official terminology.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[bnbong]

Thank you so much for your contribution!

Your contribution helps improve the clarity of FastAPI-fastkit's documentation.

These changes will be included in the upcoming v1.1.6 release note, and be applied directly at general project's document.