Update p5.Vector references

[nickmcintyre]

Preparing references in src/math/p5.Vector.js for the new website.

PR Checklist

• npm run lint passes
• [Inline documentation] is included / updated

@Qianqianye @davepagurek @limzykenneth

[davepagurek]

Should this be "creates" to have consistent tense with the others above (e.g. "returns ....")

[Qianqianye]

Thanks @nickmcintyre and @davepagurek. I updated the three 'create' to 'creates' for consistent tense.
This is a similar comment to the one in #6849.

In the new website, will the p5.Vector methods (like copy(), rotate() ) stay inside the p5.Vector reference page or to the main Reference page? If it stays inside the p5.Vector reference page, will the page layout (a list with long description) stays the same? Not sure if this is included in the upcoming 'Reorganize the Reference group/categorization and order' task.

We are aware that the following naming convention could be confusing:

• p5/rotate
• p5.Vector/rotate
• p5/copy
• p5.Vector/copy

CC @limzykenneth @davepagurek