fix: Issue#227

Fatal error: Namespace declaration statement has to be the very first statement or after any declare call in the script
sebastianbergmann#227

Author: ricfio

src/textui.rst

@@ -266,10 +266,11 @@ the following code:
             :name: textui.examples.TestCaseClass.php
 
             <?php
-            use PHPUnit\Framework\TestCase;
 
             namespace TestNamespace;
 
+            use PHPUnit\Framework\TestCase;
+
             class TestCaseClass extends TestCase
             {
                 /**