docs: update related packages sections

PR-URL: #5867
Co-authored-by: Athan Reines <kgryte@gmail.com>
Reviewed-by: Athan Reines <kgryte@gmail.com>

Author: stdlib-bot

lib/node_modules/@stdlib/constants/float32/sqrt-half/README.md

@@ -120,6 +120,12 @@ Macro for the [square root][@stdlib/math/base/special/sqrtf] of `1/2` as a singl
 
 <section class="related">
 
+* * *
+
+## See Also
+
+-   <span class="package-name">[`@stdlib/constants/float64/sqrt-half`][@stdlib/constants/float64/sqrt-half]</span><span class="delimiter">: </span><span class="description">square root of 1/2.</span>
+
 </section>
 
 <!-- /.related -->
@@ -132,6 +138,8 @@ Macro for the [square root][@stdlib/math/base/special/sqrtf] of `1/2` as a singl
 
 <!-- <related-links> -->
 
+[@stdlib/constants/float64/sqrt-half]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/constants/float64/sqrt-half
+
 <!-- </related-links> -->
 
 </section>