Update attachments help.

snap-src/bin/wekan-help

@@ -81,9 +81,9 @@ echo -e "\t$ snap set $SNAP_NAME image-compress-ratio='80'"
 echo -e "Disabled:"
 echo -e "\t$ snap set $SNAP_NAME image-compress-ratio=''"
 echo -e "\n"
-echo -e "Allow to set attachment upload into specified server location https://github.com/wekan/wekan/pull/2603"
+echo -e "Allow to set attachment upload into specified server location. Create that directory first. https://github.com/wekan/wekan/pull/2603"
 echo -e "Example:"
-echo -e "\t$ snap set $SNAP_NAME attachments-store-path='/tmp/attachments'"
+echo -e "\t$ snap set $SNAP_NAME attachments-store-path='/var/snap/wekan/common/attachments'"
 echo -e "Disabled:"
 echo -e "\t$ snap set $SNAP_NAME attachments-store-path=''"
 echo -e "\n"