docs: remove unused link definition

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---

Author: kgryte

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

@@ -375,8 +375,6 @@ int main( void ) {
 
 <section class="links">
 
-[variance]: https://en.wikipedia.org/wiki/Variance
-
 [@stdlib/array/float64]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/float64
 
 [@stdlib/stats/base/ztest/alternatives]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/ztest/alternatives

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

@@ -375,8 +375,6 @@ int main( void ) {
 
 <section class="links">
 
-[variance]: https://en.wikipedia.org/wiki/Variance
-
 [@stdlib/array/float32]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/float32
 
 [@stdlib/stats/base/ztest/alternatives]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/ztest/alternatives

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

@@ -202,8 +202,6 @@ 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/one-sample/results/float64]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/stats/base/ztest/one-sample/results/float64