Restored "maxValidityInterval" to P10D

Author: malavolti

idem-fedops/HOWTO-Shibboleth/Identity Provider/CentOS/HOWTO Install and Configure a Shibboleth IdP v4.x on CentOS with Apache2 + Jetty9.md

@@ -1238,7 +1238,7 @@ Follow these steps **ONLY IF** your organization is connected to the [GARR Netwo
         <!--
             Require a validUntil XML attribute on the root element and make sure its value is no more than 10 days into the future.
         -->
-        <MetadataFilter xsi:type="RequiredValidUntil" maxValidityInterval="P6D"/>
+        <MetadataFilter xsi:type="RequiredValidUntil" maxValidityInterval="P10D"/>
    
         <!-- 
             Consume only SP in the metadata aggregate