Fixed some issues in PHPUnit XML config examples

Author: javiereguiluz

testing.rst

@@ -882,11 +882,11 @@ configuration adds tests from a custom ``lib/tests`` directory:
         <!-- ... -->
         <testsuites>
             <testsuite name="Project Test Suite">
-                <!-- ... --->
+                <!-- ... -->
                 <directory>../lib/tests</directory>
             </testsuite>
         </testsuites>
-        <!-- ... --->
+        <!-- ... -->
     </phpunit>
 
 To include other directories in the code coverage, also edit the ``<filter>``
@@ -907,7 +907,7 @@ section:
                 </exclude>
             </whitelist>
         </filter>
-        <!-- ... --->
+        <!-- ... -->
     </phpunit>
 
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