fill missing javadoc

Author: Ghost-chu

src/main/java/org/maxgamer/quickshop/api/integration/IntegratedPlugin.java

@@ -24,6 +24,9 @@
 import org.jetbrains.annotations.NotNull;
 import org.maxgamer.quickshop.util.reload.Reloadable;
 
+/**
+ * Integration module
+ */
 public interface IntegratedPlugin extends Reloadable {
     /**
      * Return the integrated plugin name.