code: public static void generateJavaDocReturnType(MethodSpec.Builder methodBuilder, TypeName returnType) {
  		if (returnType == TypeName.VOID) {
  
  		} else if (TypeUtility.isTypeIncludedIn(returnType, Boolean.TYPE, Boolean.class)) {
  			methodBuilder.addJavadoc("\n");
  			methodBuilder.addJavadoc("@return <code>true</code> if record is inserted, <code>false</code> otherwise");
  		} else if (TypeUtility.isTypeIncludedIn(returnType, Long.TYPE, Long.class)) {
  			methodBuilder.addJavadoc("\n");
  			methodBuilder.addJavadoc("@return <strong>id</strong> of inserted record");
  		} else if (TypeUtility.isTypeIncludedIn(returnType, Integer.TYPE, Integer.class)) {
  			methodBuilder.addJavadoc("\n");
  			methodBuilder.addJavadoc("@return <strong>id</strong> of inserted record");
  		}
  		methodBuilder.addJavadoc("\n");
  	}
docs: Generate javadoc about return type of method.
  
  @param methodBuilder the method builder
  @param returnType the return type