fix javadoc (#218)

Author: nimf

grpc-gcp/build.gradle

@@ -78,12 +78,13 @@ sourceSets {
     }
 }
 
-task javadocJar(type: Jar) {
+task javadocJar(type: Jar, dependsOn: javadoc) {
     archiveClassifier = 'javadoc'
     from javadoc.destinationDir
 }
 
 task sourcesJar(type: Jar) {
+    duplicatesStrategy = DuplicatesStrategy.WARN
     archiveClassifier = 'sources'
     from sourceSets.main.allJava
 }

grpc-gcp/src/main/java/com/google/cloud/grpc/GcpManagedChannel.java

@@ -1894,7 +1894,7 @@ static List<String> getKeysFromMessage(MessageOrBuilder msg, String name) {
   /**
    * Fetch the affinity key from the message.
    *
-   * @param message the <reqT> or <respT> prototype message.
+   * @param message the &lt;ReqT&gt; or &lt;RespT&gt; prototype message.
    * @param isReq indicates if the message is a request message.
    */
   @Nullable