[Docs] Fix dead links when subsection title have underscore (shader-slang#5662)

* [Docs] Fix dead links when subsection title have underscore

a minor change on build toc script: add underscore to link instead of replacing with "-"
then I re-run the script
also I tested on local server

* Update toc.html

---------

Co-authored-by: Ellie Hermaszewska <ellieh@nvidia.com>
Co-authored-by: Yong He <yonghe@outlook.com>

Author: 3 people

docs/scripts/Program.cs

@@ -11,12 +11,13 @@ public static string getAnchorId(string title)
         {
             StringBuilder sb = new StringBuilder();
             title = title.Trim().ToLower();
+
             foreach (var ch in title)
             {
                 if (ch >= 'a' && ch <= 'z' || ch >= '0' && ch <= '9'
-                    || ch == '-')
+                    || ch == '-'|| ch =='_')
                     sb.Append(ch);
-                else if (ch==' ' || ch =='_')
+                else if (ch == ' ' )
                     sb.Append('-');
             }
             return sb.ToString();

docs/user-guide/toc.html

@@ -42,7 +42,7 @@
 <li data-link="convenience-features#subscript-operator"><span>Subscript Operator</span></li>
 <li data-link="convenience-features#tuple-types"><span>Tuple Types</span></li>
 <li data-link="convenience-features#optionalt-type"><span>`Optional&lt;T&gt;` type</span></li>
-<li data-link="convenience-features#if-let-syntax"><span>`if_let` syntax</span></li>
+<li data-link="convenience-features#if_let-syntax"><span>`if_let` syntax</span></li>
 <li data-link="convenience-features#reinterprett-operation"><span>`reinterpret&lt;T&gt;` operation</span></li>
 <li data-link="convenience-features#pointers-limited"><span>Pointers (limited)</span></li>
 <li data-link="convenience-features#extensions"><span>Extensions</span></li>
@@ -66,7 +66,7 @@
 <li data-link="capabilities#conflicting-capabilities"><span>Conflicting Capabilities</span></li>
 <li data-link="capabilities#requirements-in-parent-scope"><span>Requirements in Parent Scope</span></li>
 <li data-link="capabilities#inference-of-capability-requirements"><span>Inference of Capability Requirements</span></li>
-<li data-link="capabilities#inference-on-target-switch"><span>Inference on target_switch</span></li>
+<li data-link="capabilities#inference-on-target_switch"><span>Inference on target_switch</span></li>
 <li data-link="capabilities#capability-aliases"><span>Capability Aliases</span></li>
 <li data-link="capabilities#validation-of-capability-requirements"><span>Validation of Capability Requirements</span></li>
 </ul>