Fix scale description (#2330)

The third case of
[scaling-on-the-y-axis](https://tailwindcss.com/docs/scale#scaling-on-the-y-axis)
is to show its positive value according to the third figure.

Author: micttyoid

src/docs/scale.mdx

@@ -189,7 +189,7 @@ Use the `scale-x-<number>` utilities like `scale-x-75` and `-scale-x-150` to sca
 
 ### Scaling on the y-axis
 
-Use the `scale-y-<number>` utilities like `scale-y-75` and `-scale-y-150` to scale an element on the y-axis by a percentage of its original height:
+Use the `scale-y-<number>` utilities like `scale-y-75` and `scale-y-150` to scale an element on the y-axis by a percentage of its original height:
 
 <Figure>