docs: ensure consistency between examples

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/to-rot90/README.md

@@ -119,10 +119,10 @@ y = toRot90( x, [ 0, 1 ], -1 );
 arr = ndarray2array( y );
 // returns [ [ 4, 1 ], [ 5, 2 ], [ 6, 3 ] ]
 
-// Supports negative dimension indices:
-y = toRot90( x, [ -2, -1 ], 1 );
+// Reverse the rotation direction by reversing the dimension order:
+y = toRot90( x, [ 1, 0 ], 1 );
 arr = ndarray2array( y );
-// returns [ [ 3, 6 ], [ 2, 5 ], [ 1, 4 ] ]
+// returns [ [ 4, 1 ], [ 5, 2 ], [ 6, 3 ] ]
 ```
 
 </section>