docs: fix example

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---

Author: headlessNode

lib/node_modules/@stdlib/stats/base/ndarray/max-by/README.md

@@ -126,7 +126,7 @@ var xbuf = discreteUniform( 10, -50, 50, {
 var x = new ndarray( 'generic', xbuf, [ xbuf.length ], [ 1 ], 0, 'row-major' );
 console.log( ndarray2array( x ) );
 
-var v = maxBy( [ x ] );
+var v = maxBy( [ x ], clbk );
 console.log( v );
 ```