Update performance.xml

pmd-java/src/main/resources/category/java/performance.xml

@@ -845,7 +845,7 @@ private String baz() {
         <description>
 Switch statements are intended to be used to support complex branching behaviour. Using a switch for only a few
 cases is ill-advised, since switches are not as easy to understand as if-then statements. In these cases use the
-if-then statement to increase code readability.
+if-else statement to increase code readability.
         </description>
         <priority>3</priority>
         <properties>