update url guide to v2.0

update url guide to v2.0

Author: sIiiS

setup/view/magento/setup/readiness-check/progress.phtml

@@ -347,7 +347,7 @@
 
                 <div class="readiness-check-side">
                     <p class="side-title">Need Help?</p>
-                    <a href="http://devdocs.magento.com/guides/v1.0/install-gde/system-requirements.html" target="_blank">PHP Extension Help</a>
+                    <a href="http://devdocs.magento.com/guides/v2.0/install-gde/system-requirements.html" target="_blank">PHP Extension Help</a>
                 </div>
 
                 <span class="readiness-check-icon icon-failed-round"></span>