wordArray Updated

[madhav6ram]

Fixes #126 Updated wordArray

Added a text to indicate the purpose of the checkbox in the header of the popup, updated wordArray in background.js to include the new and missing headers. Additionally centered some poorly formatted headings in the popup for uniformity.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.

SWOC Participation

• Name: Madhav Ram
• Discord Username: Madhav#7781
• [x] I have included the issue number in my PR

[madhav6ram]

I have updated the wordArray along with previous changes. I closed the previous PR as I changed the branch name. Sorry about this, it's my first time working with merge conflicts.