Update testing-custom-queries.md (github#26278)

Co-authored-by: Ben Ahmady <32935794+subatoi@users.noreply.github.com>

content/code-security/codeql-cli/using-the-codeql-cli/testing-custom-queries.md

@@ -157,25 +157,23 @@ which is declared as a dependency for `my-query-tests`. Therefore, `EmptyThen.ql
 
 1. Create a code snippet to test. The following Java code contains an empty `if` statement on the third line. Save it in `custom-queries/java/tests/EmptyThen/Test.java`.
 
-   ```java
-
-class Test {
-  public void problem(String arg) {
-    if (arg.isEmpty())
-      ;
-    {
-      System.out.println("Empty argument");
+  ```java
+  class Test {
+    public void problem(String arg) {
+      if (arg.isEmpty())
+        ;
+      {
+        System.out.println("Empty argument");
+      }
     }
-  }
-
-  public void good(String arg) {
-    if (arg.isEmpty()) {
-      System.out.println("Empty argument");
+
+    public void good(String arg) {
+      if (arg.isEmpty()) {
+        System.out.println("Empty argument");
+      }
     }
   }
-}
-
-   ```
+  ```
 
 ### Execute the test