Add comment in example about quality

[potmo]

I opted to just add a small comment in the example so that those that search can find it.

[skeddles]

no reason this shouldn't be accepted, so dumb that this isn't explained anywhere, unless you dig through the source:

/*
Sets quality of color quantization (conversion of images to the maximum 256
colors allowed by the GIF specification). Lower values (minimum = 1)
produce better colors, but slow processing significantly. 10 is the
default, and produces good color mapping at reasonable speeds. Values
greater than 20 do not yield significant improvements in speed.
*/

although it's still not exactly clear how it's applying this quality. a value of 1 still seems to produce a few inaccurate colors sometimes.

[JoshuaPerk]

This should be accepted.

[potmo]

Its soon a year since I made this patch. What's taking so long?

[skeddles]

@eugeneware

[potmo]

2 years. Should i close it?