docs: update example

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/stats/base/sdsnanmeanors/README.md

@@ -77,7 +77,7 @@ var Float32Array = require( '@stdlib/array/float32' );
 
 var x = new Float32Array( [ 1.0, 2.0, 2.0, -7.0, -2.0, 3.0, 4.0, 2.0, NaN ] );
 
-var v = sdsnanmeanors( 4, x, 2 );
+var v = sdsnanmeanors( 5, x, 2 );
 // returns 1.25
 ```