fix: update example usage

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---

Author: gururaj1512

lib/node_modules/@stdlib/stats/base/nanmskmax/lib/index.js

@@ -29,7 +29,7 @@
 * var x = [ 1.0, -2.0, 4.0, 2.0, NaN ];
 * var mask = [ 0, 0, 1, 0, 0 ];
 *
-* var v = nanmskmax( 5, x, 1 );
+* var v = nanmskmax( x.length, x, 1 );
 * // returns 2.0
 *
 * @example

lib/node_modules/@stdlib/stats/base/nanmskmax/lib/main.js

@@ -20,8 +20,6 @@
 
 // MODULES //
 
-// MODULES //
-
 var stride2offset = require( '@stdlib/strided/base/stride2offset' );
 var ndarray = require( './ndarray.js' );
 
@@ -42,7 +40,7 @@ var ndarray = require( './ndarray.js' );
 * var x = [ 1.0, -2.0, 4.0, 2.0, NaN ];
 * var mask = [ 0, 0, 1, 0, 0 ];
 *
-* var v = nanmskmax( 5, x, 1, mask, 1 );
+* var v = nanmskmax( x.length, x, 1, mask, 1 );
 * // returns 2.0
 */
 function nanmskmax( N, x, strideX, mask, strideMask ) {