comment added

Author: SimaTian

.azure/pipelines/ci-public.yml

@@ -77,6 +77,7 @@ variables:
   value: false
 - name: Codeql.SkipTaskAutoInjection
   value: true
+# MSBUILD Server dogfooding
 - name: MSBUILDUSESERVER
   value: 1
 - template: /eng/common/templates/variables/pool-providers.yml