update comment since Maven no longer uses LATEST (#2126)

Author: elharo

plugins/com.google.cloud.tools.eclipse.dataflow.core/src/com/google/cloud/tools/eclipse/dataflow/core/project/DataflowDependencyManager.java

@@ -74,8 +74,8 @@ private DataflowDependencyManager(
   }
 
   /**
-   * Retrieves a dependency on the Dataflow Java SDK. If trackUpdates is true, the version is
-   * LATEST. Otherwise, the version is [Current Version, Next Major Version).
+   * Retrieves a dependency on the Dataflow Java SDK or null if there is no version in the range.
+   * The version is [Current Version, Next Major Version).
    */
   public ArtifactVersion getLatestDataflowDependencyInRange(VersionRange currentVersionRange) {
     return artifactRetriever.getLatestSdkVersion(currentVersionRange);