doc/tutorial: address cuelang/cuelang.org#126
doc/tutorial: address cuelang/cuelang.org#126

@j-bai raised https://github.com/cuelang/cuelang.org/issues/126, pointing out that the roles of `xaxis` and `yaxis` are backwards. This addresses the issue.

Closes #711
https://github.com/cuelang/cue/pull/711

GitOrigin-RevId: 186399f9040cd6111214f92cd8d1d94c5908ffd7
Change-Id: I439cf405ce4174d75917c550c9ef3b91ff9ab54c
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/8622
Reviewed-by: CUE cueckoo <0f32a827c9a5f00281f936ac78b5ef3ba80a954c@gmail.com>
Reviewed-by: Marcel van Lohuizen <a22d082192f3ccf984644a4f482781f4c2d65180@golang.org>

cuelang/cue