fix(lib): fixed broadcast arrays main.js doctest

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Author: lohithganni

lib/node_modules/@stdlib/ndarray/base/broadcast-arrays/lib/main.js

@@ -55,7 +55,7 @@ var getShape = require( '@stdlib/ndarray/base/shape' );
 * // returns [ 3, 2, 2 ]
 *
 * var out = broadcastArrays( [ x1, y1 ] );
-* // returns <ndarray>
+* // returns [ <ndarray> , <ndarray> ]
 *
 * var x2 = out[ 0 ];
 * // returns <ndarray>