docs: fix example

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/stats/base/ndarray/smskrange/README.md

@@ -91,9 +91,9 @@ var ndarray2array = require( '@stdlib/ndarray/to-array' );
 var mskrange = require( '@stdlib/stats/base/ndarray/mskrange' );
 
 var xbuf = uniform( 10, -50.0, 50.0, {
-    'dtype': 'generic'
+    'dtype': 'float32'
 });
-var x = new ndarray( 'generic', xbuf, [ xbuf.length ], [ 1 ], 0, 'row-major' );
+var x = new ndarray( 'float32', xbuf, [ xbuf.length ], [ 1 ], 0, 'row-major' );
 console.log( ndarray2array( x ) );
 
 var maskbuf = bernoulli( xbuf.length, 0.2, {