Apply parentheses consistently within <methodname/>

Prior to change, there were 175 instances of <methodname/> elements
including parentheses (e.g.: <methodname>foo()</methodname>, and
36 instances without.

Now all 211 instances include parentheses for consistency.

spring-framework-reference/src/validation.xml

@@ -1192,9 +1192,9 @@ public interface Parser<T> {
       <para> To create your own Formatter, simply implement the Formatter
         interface above. Parameterize T to be the type of object you wish to
         format, for example, <classname>java.util.Date</classname>. Implement
-        the <methodname>print</methodname> operation to print an instance of T
+        the <methodname>print()</methodname> operation to print an instance of T
         for display in the client locale. Implement the
-        <methodname>parse</methodname> operation to parse an instance of T from
+        <methodname>parse()</methodname> operation to parse an instance of T from
         the formatted representation returned from the client locale. Your
         Formatter should throw a ParseException or IllegalArgumentException if a
         parse attempt fails. Take care to ensure your Formatter implementation
@@ -1273,10 +1273,10 @@ public interface AnnotationFormatterFactory<A extends Annotation> {
       <para> Parameterize A to be the field annotationType you wish to associate
         formatting logic with, for example
         <code>org.springframework.format.annotation.DateTimeFormat</code>. Have
-        <methodname>getFieldTypes</methodname> return the types of fields the
-        annotation may be used on. Have <methodname>getPrinter</methodname>
+        <methodname>getFieldTypes()</methodname> return the types of fields the
+        annotation may be used on. Have <methodname>getPrinter()</methodname>
         return a Printer to print the value of an annotated field. Have
-        <methodname>getParser</methodname> return a Parser to parse a
+        <methodname>getParser()</methodname> return a Parser to parse a
         clientValue for an annotated field. </para>
 
       <para> The example AnnotationFormatterFactory implementation below binds