Fix jsdoc in setWordWrapWidth from Text and TextStyle

[AlbertMontagutCasero]

This PR

• Updates the JSDocumentation
• Fixes a bug

Describe the changes below:

I was using typescript phaser version when I found an issue with Phaser.GameObjects.Text.setWordWrapWidth, the method description says: params width - The maximum width of a line in pixels. Set to null to remove wrapping.

So I tried to set it to null.

But the following typescript error appeared. That's because the method jsdoc don't allow passing null, just undefined.
Reading the source code, I found that null is the correct value to pass here.

This PR changes the jsdoc to allow passing null to the method without errors.

I didn't generate the .d.ts definitions with npm run tsgen, which is something I think should be done by the maintainers of the project when new releases of the project are generated. Please do it after these changes.

I hope it helps, have a nice day!