ci: add steps to check docs stage

Jenkinsfile2

@@ -360,10 +360,12 @@ pipeline {
             parallel {
                 stage('check docs') {
                     agent{label " worker03 || slave215 || slave217 || slave219 || Mac_catalina "}
+                    steps {
                         check_docs()
                     }
                 }
             }
+        }
         stage('run test') {
             when {
                 allOf {