updated broken link

Author: ploegert

msal-dotnet-articles/TOC.yml

@@ -26,7 +26,7 @@
         - name: Acquiring tokens interactively
           href: acquiring-tokens/desktop-mobile/acquiring-tokens-interactively.md
         - name: Using MSAL.NET with Web Account Manager (WAM)
-          href: ./acquiring-tokens/desktop-mobile/wam.
+          href: ./acquiring-tokens/desktop-mobile/wam.md
         - name: Using MSAL.Net with broker on Linux distributions
           href: ./acquiring-tokens/desktop-mobile/linux-dotnet-sdk.md
         - name: Using MSAL.Net with WSL