Update nfs4-file-acl.md

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

-NFSv4 ACL
-==================
-at the first - knowledge of ACL is necessary
+# NFSv4 ACL
+
+At the first - knowledge of ACL is necessary
 
 ACL - access control list
 ACE - access control entry
@@ -8,9 +8,11 @@ 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:
 
-    <type>:<flags>:<principal>:<permissions>
-    
-    
+``` code
+<type>:<flags>:<principal>:<permissions>
+```
+
+``` code
 [root@login2.salomon proj1]# nfs4_getfacl open-20-11
 
 # file: open-20-11
@@ -22,25 +24,24 @@ A:fdi:OWNER@:rwaDxtTcCy
 A:fdi:GROUP@:rxtcy
 A:fdig:open-20-11@it4i.cz:rwaDxtcy
 A:fdi:EVERYONE@:tcy
- 
-
-    * <type> - one of:
-        'A'  allow
-        'D'  deny
-        'U'  audit
-        'L'  alarm
-
-    * <flags> - zero or more (depending on <type>) of:
-        '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@"
-
+```
+´
+* <type> - one of:
+'A'  allow
+'D'  deny
+'U'  audit
+'L'  alarm
+
+* <flags> - zero or more (depending on <type>) of:
+'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:
         'r'  read-data / list-directory 
         'w'  write-data / create-file