Fixed link to source code for Lut

[ComanderKai77]

The link to get to the source code from the Lut does not work.
See https://threejs.org/docs/index.html#examples/en/math/Lut and click on Source to reproduce.

[Mugen87]

Good find! Do you mind fixing this for the Chinese document, too?

https://threejs.org/docs/index.html#examples/zh/math/Lut

[ComanderKai77]

Good find! Do you mind fixing this for the Chinese document, too?

https://threejs.org/docs/index.html#examples/zh/math/Lut

Sure thing ;)

[mrdoob]

Thanks!