Add missing @Override annotations (#5430)

core/src/main/java/hudson/PluginWrapper.java

@@ -449,6 +449,7 @@ public class PluginWrapper implements Comparable<PluginWrapper>, ModelObject {
         this.archive = archive;
     }
 
+    @Override
     public String getDisplayName() {
         return StringUtils.removeStart(getLongName(), "Jenkins ");
     }
@@ -1073,6 +1074,7 @@ public class PluginWrapper implements Comparable<PluginWrapper>, ModelObject {
     /**
      * Sort by short name.
      */
+    @Override
     public int compareTo(PluginWrapper pw) {
         return shortName.compareToIgnoreCase(pw.shortName);
     }
@@ -1134,6 +1136,7 @@ public class PluginWrapper implements Comparable<PluginWrapper>, ModelObject {
             plugins.put(plugin.shortName, plugin);
         }
 
+        @Override
         public boolean isActivated() {
             return !plugins.isEmpty();
         }