Update 0015-ossec_rules.xml

Author: Pablo Navarro

rules/0015-ossec_rules.xml

@@ -186,7 +186,7 @@
   <rule id="536" level="0">
     <if_sid>531</if_sid>
       <regex>'df -P':\s+/dev/loop\d+\s+\d+\s+\d+\s+0\s+100%\s+/snap/\w+/\d+</regex>
-      <description>Ignore snap disks because are always 100% of capacity</description>
+      <description>Ignore snap disks because they are always at 100% of capacity</description>
   </rule>