docs: add example

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Author: kgryte

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

@@ -30,3 +30,6 @@ console.log( d );
 
 d = ulpdiff( 0.0, SMALLEST_SUBNORMAL );
 console.log( d );
+
+d = ulpdiff( 0.0, -0.0 );
+console.log( d );