fix link

Author: genlin

support/entra/entra-id/toc.yml

@@ -52,7 +52,7 @@
       - name: IDX10501 Error in ASP.NET Core with Azure B2C Custom Policy
         href: app-integration/troubleshoot-error-idx10501-aspnet-b2c.md
       - name: WIF10201 No valid key mapping found
-        href: app-integration/troubleshoot-wif10201-no-valid key-securitytoken-mvc.md
+        href: app-integration/troubleshoot-wif10201-no-validkey-securitytoken-mvc.md
 
   - name: Troubleshoot adding apps
     href: app-integration/troubleshoot-adding-apps.md