docs: add return annotations to examples

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Author: anandkaranubc

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

@@ -24,15 +24,20 @@ var ulpdiff = require( './../lib' );
 
 var d = ulpdiff( 1.0, 1.0+EPS );
 console.log( d );
+// => 1.0
 
 d = ulpdiff( 5.8364e-319, 5.8367e-319 );
 console.log( d );
+// => 6.0
 
 d = ulpdiff( 0.0, SMALLEST_SUBNORMAL );
 console.log( d );
+// => 1.0
 
 d = ulpdiff( 0.0, -0.0 );
 console.log( d );
+// => 0.0
 
 d = ulpdiff( SMALLEST_SUBNORMAL, -SMALLEST_SUBNORMAL );
 console.log( d );
+// => 2.0