Small updates for pygame comparison

[Starbuck5]

Hello! I was happy to see pygame-ce had been added to this comparison page, it spurred me to do a few small updates. Hopefully these are agreeable.

• added pygame-ce examples link like pygame
• pygame and pygame-ce are type hinted and have been for a while. Perhaps this is an artifact from before this was the case?
• pygame-ce supports many different kinds of transparency. If you load an image that has transparency it will have transparency. Pygame and pygame-ce support colorkeying too, but we also support per pixel alpha and global alpha for a surface.
• I rewrote note 1 a bit, spurred by "write the image to a surface." Any loaded image is already a Surface, there's no write operation needed. And you don't need to make a Sprite out of a surface to use it, and even if you did that's not an expensive operation in pygame so it's strange to mention.
• Also the links at the bottom were unused as far as I could tell so I removed them