Fixing ellipse() and arc detail bug and adding unit test to cover p5.RendererGL.prototype.ellipse and p5.RendererGL.prototype.arc

[duskvirkus]

Resolves #5102

Changes:

• Fixed bug for when a detail parameter of greater than 50 is passed to ellipse or arc this._renderer is undefined.
• Changed wording on no stroke with > 50 detail warning message.
• Updated documentation on ellipse and arc to reflect that they don't render a stroke when detail > 50.
• Added unit tests that cover all lines of p5.RendererGL.prototype.ellipse and p5.RendererGL.prototype.arc. Something that previously was completely uncovered.

Screenshots of the change: N/A

PR Checklist

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

Any suggestions or modifications are very much welcome. 💕

[stalgiag]

Awesome! Thank you for the very clear and thorough PR.