BLT-1479: correcting example path to the docroot/core/phpunit.xml.dist file. (#1480)

Author: mikemadison13

phing/build.yml

@@ -133,7 +133,7 @@ phpunit:
   # Customization for one or more custom phpunit test locations
   # and if the core (or custom) config file should be included as a -c parameter.
   # - path: '${docroot}/custom/modules/<your_module>/tests'
-  #   config: '${docroot}/core/phpunit.dist.xml'
+  #   config: '${docroot}/core/phpunit.xml.dist'
 project:
   local:
     uri: ${project.local.protocol}://${project.local.hostname}