fixed parameters for normal() method

[kaiserarg]

Resolves #6982

Changes:

It seems that in src\core\shape\vertex.js for the normal() method the documentation was written as @param {Vector} vector and since Vector isn't a native JS class when the FES couldn't use instanceOf to check and typeOf checked the e.g. example let n = createVector(-0.4, -0.4, 0.8); which would return object since Vector is not a native JS class.

A quick and easy fix would be to change @param {Vector} vector to @param {p5.Vector} vector so FES can correctly check the parameter.

Screenshots of the change:

PR Checklist

• npm run lint passes
• Inline documentation is included / updated
• Unit tests are included / updated

[davepagurek]

Thanks for the fix!