Minor copy-paste error "Bind the position buffer"

[timdream]

There are multiple instances so the fix is more involved than using GitHub web interface. The comment in example says // Bind the position buffer. while the line right below binds texcoordBuffer (the texture buffer).

webgl-fundamentals/webgl/webgl-3d-textures-mips.html

Line 189 in f6ec7b1

// Bind the position buffer.

[greggman]

Thanks. Yea there were a lot of them. Hopefully I found most of them and didn't mess things up.

c05f911