added a note to opache.fast_shutdown why its not enabled by default in php.ini

Author: staabm

php.ini-development

@@ -1805,6 +1805,7 @@ ldap.max_links = -1
 ;opcache.save_comments=1
 
 ; If enabled, a fast shutdown sequence is used for the accelerated code
+; Depending on the used Memory Manager this may cause some incompatibilities.
 ;opcache.fast_shutdown=0
 
 ; Allow file existence override (file_exists, etc.) performance feature.

php.ini-production

@@ -1805,6 +1805,7 @@ ldap.max_links = -1
 ;opcache.save_comments=1
 
 ; If enabled, a fast shutdown sequence is used for the accelerated code
+; Depending on the used Memory Manager this may cause some incompatibilities.
 ;opcache.fast_shutdown=0
 
 ; Allow file existence override (file_exists, etc.) performance feature.