Docs for scale

Issue description

The documentation of scale says:

"For example, the function call scale(2.0) increases the dimension of a shape by 200%."

This is unfortunately a mistake. Let's say the unit of the x-axis before the scaling is 10,
then after it is 2*10=20. The growth is 20-10=10. Which amounts to 100%.

Scaling with s gives in general a growth of s-1.

Now it not just the sentence above that needs a change: the parameters s, x and y
are described as "percentages". This should be changed to "scalar" or "factor" or similar.

URL(s) of affected page(s)

https://processing.org/reference/scale_.html

Proposed fix

打开 https://processing.org/reference/scale_.html 上受影响的 scale 参考页面，并在 processing-website 仓库中找到其源文件。更正示例中的百分比说明，并将对 s、x 和 y 的描述从百分比术语改为标量或因子术语；页面文本应始终描述缩放增长。