[Docs] Fix dead links when subsection title have underscore (#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>

1 files changed, 3 insertions, 2 deletions

diff --git a/docs/scripts/Program.cs b/docs/scripts/Program.cs
index b256af1b2..8a87f153d 100644
--- a/docs/scripts/Program.cs
+++ b/docs/scripts/Program.cs
@@ -11,12 +11,13 @@ namespace toc
         {
             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();