Fixing function documentation. 10k per pixel

[DollarAkshay]

Brief Description

I just corrected the comment string for Game.cpu.generatePixel() which said it generates 1 pixel for every 5k CPU. It is actually 10k pixel as per the docs

Checklists

• Test passed
• Coding style (indentation, etc)
• Edits have been made to src/ files not index.d.ts
• Run npm run dtslint to update index.d.ts

[pyrodogg]

Always notice more just after I submit a PR to DT 🤣

Thanks for the PR, I'll get this added to the current PR with DefinitelyTyped.