docs: update related packages sections

PR-URL: 	#2155
Reviewed-by: Athan Reines <kgryte@gmail.com>

lib/node_modules/@stdlib/ndarray/at/README.md

@@ -164,6 +164,13 @@ for ( i = 0; i < x.length; i++ ) {
 
 <section class="related">
 
+* * *
+
+## See Also
+
+-   <span class="package-name">[`@stdlib/ndarray/array`][@stdlib/ndarray/array]</span><span class="delimiter">: </span><span class="description">multidimensional arrays.</span>
+-   <span class="package-name">[`@stdlib/ndarray/slice`][@stdlib/ndarray/slice]</span><span class="delimiter">: </span><span class="description">return a read-only view of an input ndarray.</span>
+
 </section>
 
 <!-- /.related -->
@@ -174,6 +181,14 @@ for ( i = 0; i < x.length; i++ ) {
 
 [@stdlib/ndarray/ctor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/ndarray/ctor
 
+<!-- <related-links> -->
+
+[@stdlib/ndarray/array]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/ndarray/array
+
+[@stdlib/ndarray/slice]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/ndarray/slice
+
+<!-- </related-links> -->
+
 </section>
 
 <!-- /.links -->