Improve pixi.js text documentation

https://pixijs.com/8.x/examples/text/pixi-text

The text in the pixi.js documentation page is pretty obviously blurry on my laptop. 

The solution was proposed by Flowreen on discord:

https://discord.com/channels/734147990985375826/1143191340230914068/1357782254541213706

This should be included in the documentation page.