MINOR: KAFKA-3361 follow up

Author: Grant Henke <granthenke@gmail.com>

Reviewers: Gwen Shapira

Closes #1037 from granthenke/protocol-minor

build.gradle

@@ -352,14 +352,14 @@ project(':core') {
 
   task genProtocolErrorDocs(type: JavaExec) {
     classpath = sourceSets.main.runtimeClasspath
-    main = 'org.apache.kafka.common.protocol.Protocol'
+    main = 'org.apache.kafka.common.protocol.Errors'
     if( !generatedDocsDir.exists() ) { generatedDocsDir.mkdirs() }
     standardOutput = new File(generatedDocsDir, "protocol_errors.html").newOutputStream()
   }
 
   task genProtocolApiKeyDocs(type: JavaExec) {
     classpath = sourceSets.main.runtimeClasspath
-    main = 'org.apache.kafka.common.protocol.Protocol'
+    main = 'org.apache.kafka.common.protocol.ApiKeys'
     if( !generatedDocsDir.exists() ) { generatedDocsDir.mkdirs() }
     standardOutput = new File(generatedDocsDir, "protocol_api_keys.html").newOutputStream()
   }
@@ -752,7 +752,7 @@ project(':connect:runtime') {
     dependsOn copyDependantLibs
   }
 
-  tasks.create(name: "genConnectConfigDocs", dependsOn:jar, type: JavaExec) {
+  task genConnectConfigDocs(type: JavaExec) {
     classpath = sourceSets.main.runtimeClasspath
     main = 'org.apache.kafka.connect.runtime.distributed.DistributedConfig'
     if( !generatedDocsDir.exists() ) { generatedDocsDir.mkdirs() }