Fix some issues caught by IntelliJ static code analysis

The most common issues were:
* Arrays.asList() shouldn't be called with a single parameter.
* Broken Javadoc @links.
* Unnecessary casts and type declarations.
* Unnecessary unused variable initializations.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=230994311

java/google/registry/model/package-info.java

@@ -28,7 +28,7 @@ import javax.xml.bind.annotation.XmlNsForm;
 import javax.xml.bind.annotation.XmlSchema;
 import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
 
-/**
+/*
  * This package defines all entities which are managed via EPP XML and persisted to the Datastore
  * via Objectify.
  *