docs: remove unused definition

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Author: kgryte

lib/node_modules/@stdlib/stats/strided/ztest2/README.md

@@ -219,8 +219,6 @@ console.log( out.toString() );
 
 <section class="links">
 
-[variance]: https://en.wikipedia.org/wiki/Variance
-
 [@stdlib/stats/base/ztest/alternatives]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/ztest/alternatives
 
 [@stdlib/stats/base/ztest/two-sample/results/float64]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/ztest/two-sample/results/float64