docs: remove orphan ndarray2array require in stats/base/ndarray/cumin

Propagates fix from 0873811 ("docs: inline ndarray output in doctests and add missing article") to `stats/base/ndarray/cumin/lib/main.js`, removing the orphan `@stdlib/ndarray/to-array` require in the `@example` block since the output is already shown via the inline `<ndarray>[ ... ]` form.

Author: claude

lib/node_modules/@stdlib/stats/base/ndarray/cumin/lib/main.js

@@ -36,7 +36,6 @@ var strided = require( '@stdlib/stats/base/cumin' ).ndarray;
 * @returns {ndarrayLike} output ndarray
 *
 * @example
-* var ndarray2array = require( '@stdlib/ndarray/to-array' );
 * var ndarray = require( '@stdlib/ndarray/base/ctor' );
 *
 * var xbuf = [ 1.0, 3.0, 4.0, 2.0 ];