Replaced principals with principles

[EddieMachete]

Pull Request

📖 Description

Closes #6738

The introduction page has the following line of text:

One of FAST's driving principals is "strive to adopt open, web standards-based approaches as much as possible."

I believe the line is referring to principles as opposed to principals.

As a solution, I have just replaced the word principals with principles.

🎫 Issues

• Spelling mistake on docs/introduction #6738

👩‍💻 Reviewer Notes

This is a simple content change. Just make sure the new copy makes sense and the change looks correct.

📑 Test Plan

• principals has been replaced with principles

Test Case

1. Open the documentation site and navigate to the introduction page /docs/introduction/
2. Confirm that the text One of FAST's driving principals is has been changed to One of FAST's driving principles is

✅ Checklist

General

• I have searched open/closed issues before submitting
• I have included a change request file using $ yarn change
• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

⏭ Next Steps

Not applicable