Fix duplicate entry for Warning C26864 in toc.yml

Author: TylerMSFT

docs/code-quality/toc.yml

@@ -661,7 +661,7 @@ items:
     href: ../code-quality/c26863.md
   - name: Warning C26864
     href: ../code-quality/c26864.md
-  - name: Warning C26864
+  - name: Warning C26865
     href: ../code-quality/c26865.md
   - name: Warning C28020
     href: ../code-quality/c28020.md