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.

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

java/google/registry/model/EppResource.java

@@ -369,15 +369,8 @@ public abstract class EppResource extends BackupGroupRoot implements Buildable {
         Streams.stream(keys).map(key -> (Key<EppResource>) key).collect(toImmutableList());
 
     // Typing shenanigans are required to return the map with the correct required generic type.
-    return ofy()
-        .load()
-        .keys(typedKeys)
-        .entrySet()
-        .stream()
-        .collect(
-            ImmutableMap
-                .<Map.Entry<Key<EppResource>, EppResource>, Key<? extends EppResource>, EppResource>
-                    toImmutableMap(Entry::getKey, Entry::getValue));
+    return ofy().load().keys(typedKeys).entrySet().stream()
+        .collect(ImmutableMap.toImmutableMap(Entry::getKey, Entry::getValue));
   }
 
   /**

java/google/registry/model/SchemaVersion.java

@@ -33,11 +33,10 @@ public final class SchemaVersion {
    */
   private static SortedSet<Class<?>> getAllPersistedTypes() {
     SortedSet<Class<?>> persistedTypes = new TreeSet<>(Ordering.usingToString());
-    Queue<Class<?>> queue = new ArrayDeque<>();
     // Do a breadth-first search for persisted types, starting with @Entity types and expanding each
     // ImmutableObject by querying it for all its persisted field types.
     persistedTypes.addAll(EntityClasses.ALL_CLASSES);
-    queue.addAll(persistedTypes);
+    Queue<Class<?>> queue = new ArrayDeque<>(persistedTypes);
     while (!queue.isEmpty()) {
       Class<?> clazz = queue.remove();
       if (ImmutableObject.class.isAssignableFrom(clazz)) {

java/google/registry/model/ofy/AugmentedDeleter.java

@@ -60,7 +60,7 @@ abstract class AugmentedDeleter implements Deleter {
 
   @Override
   public Result<Void> key(Key<?> key) {
-    handleDeletion(Arrays.asList(key));
+    handleDeletion(ImmutableList.of(key));
     return delegate.keys(key);
   }
 

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.
  *