Update nfs4-file-acl.md

docs.it4i/storage/nfs4-file-acl.md

 # NFSv4 ACL
 
-At the first - knowledge of ACL is necessary
+An NFSv4 ACL consists of one or more NFSv4 ACEs (Access Control Entry), each delimited by a comma or whitespace.
 
-ACL - access control list
-ACE - access control entry
-
-An NFSv4 ACL consists of one or more NFSv4 ACEs, each delimited by commas or whitespace.
 An NFSv4 ACE is written as a colon-delimited, 4-field string in the following format:
 
 ``` code
 <type>:<flags>:<principal>:<permissions>
 ```
+## ACE Elements
+
+* <type> - one of:
+
+| Flag | Name  |
+| ---- | ----- |
+| A    | allow |
+| D    | deny  |
+| U    | audit |
+| L    | alarm |
+
+* <flags> - zero or more (depending on <type>) of:
+
+| Flag | Name                                        |
+| ---- | ------------------------------------------- |
+| f    | file-inherit                                |
+| d    | directory-inherit                           |
+| p    | no-propagate-inherit                        |
+| i    | inherit-only                                |
+| S    | successful-access                           |
+| F    | failed-access                               |
+| g    | group (denotes that <principal> is a group) |
+
+* <principal> - named user or group, or one of: "OWNER@", "GROUP@", "EVERYONE@"
+
+* <permissions> - one or more of:
+
+| Flag | Name                              |
+| ---- | --------------------------------- |
+| r    | read-data / list-directory        |
+| w    | write-data / create-file          |
+| a    | append-data / create-subdirectory |
+| x    | execute                           |
+| d    | delete                            |
+| D    | delete-child (directories only)   |
+| t    | read-attrs                        |
+| T    | write-attrs                       |
+| n    | read-named-attrs                  |
+| N    | write-named-attrs                 |
+| c    | read-ACL                          |
+| C    | write-ACL                         |
+| o    | write-owner                       |
+| y    | synchronize                       |
+
+## Example
 
 ``` code
 [root@login2.salomon proj1]# nfs4_getfacl open-20-11
@@ -25,45 +66,3 @@ A:fdi:GROUP@:rxtcy
 A:fdig:open-20-11@it4i.cz:rwaDxtcy
 A:fdi:EVERYONE@:tcy
 ```
-
-* <type> - one of:
-
-| Flag || Name  |
-| ---- || ----- |
-| A    || allow |
-| D    || deny  |
-| U    || audit |
-| L    || alarm |
-
-* <flags> - zero or more (depending on <type>) of:
-
-| Flag || Name                                        |
-| ---- || ------------------------------------------- |
-| f    || file-inherit                                |
-| d    || directory-inherit                           |
-| p    || no-propagate-inherit                        |
-| i    || inherit-only                                |
-| S    || successful-access                           |
-| F    || failed-access                               |
-| g    || group (denotes that <principal> is a group) |
-
-* <principal> - named user or group, or one of: "OWNER@", "GROUP@", "EVERYONE@"
-
-* <permissions> - one or more of:
-
-| Flag || Name                              |
-| ---- || --------------------------------- |
-| r    || read-data / list-directory        |
-| w    || write-data / create-file          |
-| a    || append-data / create-subdirectory |
-| x    || execute                           |
-| d    || delete                            |
-| D    || delete-child (directories only)   |
-| t    || read-attrs                        |
-| T    || write-attrs                       |
-| n    || read-named-attrs                  |
-| N    || write-named-attrs                 |
-| c    || read-ACL                          |
-| C    || write-ACL                         |
-| o    || write-owner                       |
-| y    || synchronize                       |