docs: add link for ulp wiki page

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---

Author: anandkaranubc

lib/node_modules/@stdlib/number/float64/base/ulp-difference/README.md

@@ -76,7 +76,7 @@ d = ulpdiff( NaN, NaN );
 
 ## Notes
 
--   Adjacent [double-precision][double-precision] floating-point numbers differ by `1` ulp (unit in the last place).
+-   Adjacent [double-precision][double-precision] floating-point numbers differ by `1` [ulp][ulp] (unit in the last place).
 -   Signed zeros differ only in the sign bit but are considered numerically equal, and thus their ULP difference is `0`.
 
 </section>
@@ -129,6 +129,7 @@ console.log( d );
 <section class="links">
 
 [double-precision]: https://en.wikipedia.org/wiki/Double-precision_floating-point_format
+[ulp]: https://en.wikipedia.org/wiki/Unit_in_the_last_place
 
 <!-- <related-links> -->