docs: update namespace table of contents

PR-URL: stdlib-js#8554
Reviewed-by: Athan Reines <[email protected]>

Author: stdlib-bot

lib/node_modules/@stdlib/symbol/README.md

@@ -50,6 +50,8 @@ The namespace contains the following:
 -   <span class="signature">[`HasInstanceSymbol`][@stdlib/symbol/has-instance]</span><span class="delimiter">: </span><span class="description">has instance symbol which is used to determine if a constructor object recognizes an object as its instance.</span>
 -   <span class="signature">[`IsConcatSpreadableSymbol`][@stdlib/symbol/is-concat-spreadable]</span><span class="delimiter">: </span><span class="description">concat spreadable symbol which specifies whether an array-like object should be flattened to its array elements during concatenation.</span>
 -   <span class="signature">[`IteratorSymbol`][@stdlib/symbol/iterator]</span><span class="delimiter">: </span><span class="description">iterator symbol which specifies the default iterator for an object.</span>
+-   <span class="signature">[`ReplaceSymbol`][@stdlib/symbol/replace]</span><span class="delimiter">: </span><span class="description">symbol which provides a method for replacing substrings matched by the current object.</span>
+-   <span class="signature">[`ToPrimitiveSymbol`][@stdlib/symbol/to-primitive]</span><span class="delimiter">: </span><span class="description">symbol which specifies a method for converting an object to a primitive value.</span>
 
 </div>
 
@@ -102,6 +104,10 @@ console.log( objectKeys( ns ) );
 
 [@stdlib/symbol/iterator]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/symbol/iterator
 
+[@stdlib/symbol/replace]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/symbol/replace
+
+[@stdlib/symbol/to-primitive]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/symbol/to-primitive
+
 <!-- </toc-links> -->
 
 </section>