Closes zendframework#606 - Fix typo in Zend_Cache-Backends documentation

Author: froschdesign

documentation/manual/en/module_specs/Zend_Cache-Backends.xml

@@ -95,7 +95,7 @@
                         <entry><emphasis>hashed_directory_perm</emphasis></entry>
                         <entry><type>Integer</type></entry>
                         <entry>0700</entry>
-                        <entry>Permissins for the hashed directory structure</entry>
+                        <entry>Permissions for the hashed directory structure</entry>
                     </row>
 
                     <row>