fix: update ztest2 function call

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Author: gururaj1512

lib/node_modules/@stdlib/stats/strided/ztest2/lib/ndarray.js

@@ -69,7 +69,7 @@ var WORKSPACE = new Float64Array( 2 );
 * var y = [ 3.0, 3.0, 5.0, 7.0, 7.0 ];
 *
 * var results = new Results();
-* var out = ztest2.ndarray( x.length, y.length, 'two-sided', 0.05, 0.0, 1.0, 2.0, x, 1, 0, y, 1, 0, results );
+* var out = ztest2( x.length, y.length, 'two-sided', 0.05, 0.0, 1.0, 2.0, x, 1, 0, y, 1, 0, results );
 * // returns {...}
 *
 * var bool = ( out === results );