doc: add Triagers section to table of contents in GOVERNANCE.md

PR-URL: #34504
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Harshitha K P <harshitha014@gmail.com>

GOVERNANCE.md

@@ -2,6 +2,7 @@
 
 <!-- TOC -->
 
+* [Triagers](#triagers)
 * [Collaborators](#collaborators)
   * [Collaborator Activities](#collaborator-activities)
 * [Technical Steering Committee](#technical-steering-committee)