Fix a few stylistic issues in preparation for Checkstyle addition

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=230524735

java/google/registry/tools/server/KillAllEppResourcesAction.java

@@ -53,7 +53,7 @@ public class KillAllEppResourcesAction implements Runnable {
 
   @Override
   public void run() {
-    checkArgument( // safety
+    checkArgument(
         RegistryEnvironment.get() == RegistryEnvironment.CRASH
             || RegistryEnvironment.get() == RegistryEnvironment.UNITTEST,
         "DO NOT RUN ANYWHERE ELSE EXCEPT CRASH OR TESTS.");