docs: update example

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---

Author: kgryte

lib/node_modules/@stdlib/random/base/mt19937/examples/index.js

@@ -20,19 +20,16 @@
 
 var mt19937 = require( './../lib' );
 
-var seed;
-var rand;
-var i;
-
 // Generate pseudorandom numbers...
 console.log( '\nseed: %d', mt19937.seed[ 0 ] );
+var i;
 for ( i = 0; i < 100; i++ ) {
 	console.log( mt19937() );
 }
 
 // Create a new pseudorandom number generator...
-seed = 1234;
-rand = mt19937.factory({
+var seed = 1234;
+var rand = mt19937.factory({
 	'seed': seed
 });
 console.log( '\nseed: %d', seed );