docs: add example

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---

Author: kgryte

lib/node_modules/@stdlib/number/float64/base/ulp-difference/examples/index.js

@@ -19,10 +19,14 @@
 'use strict';
 
 var EPS = require( '@stdlib/constants/float64/eps' );
+var SMALLEST_SUBNORMAL = require( '@stdlib/constants/float64/smallest-subnormal' );
 var ulpdiff = require( './../lib' );
 
 var d = ulpdiff( 1.0, 1.0+EPS );
 console.log( d );
 
 d = ulpdiff( 5.8364e-319, 5.8367e-319 );
 console.log( d );
+
+d = ulpdiff( 0.0, SMALLEST_SUBNORMAL );
+console.log( d );