fix(docs/introduction): fix typo in introduction

[ghost]

🔗 Linked issue

N/A

❓ Type of change

• [x] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This change fixes a typo in the introduction:

https://github.com/adonisjs/docs.adonisjs.com/blob/33eb6360912cc9305db8e1b688de8557cc7310a0/content/guides/introduction.md?plain=1#L53

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📝 Checklist

• [ ] I have linked an issue or discussion.
• [x] I have updated the documentation accordingly.

[ghost]

Has the core team considered adding a check box in the description and checklist for fixing typos?

[RomainLanz]

Thanks!

[RomainLanz]

Has the core team considered adding a check box in the description and checklist for fixing typos?

Not really needed for content change 😄