Update standard-file-acl.md (user john)

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

@@ -12,10 +12,10 @@ To show permissions, use:
 
 ### Examples
 
-Set all permissions for user John to file named abc:
+Set all permissions for user john to file named abc:
 
 ```code
-# setfacl -m "u:John:rwx" abc
+# setfacl -m "u:john:rwx" abc
 ```
 
 Check permissions:
@@ -26,16 +26,16 @@ Check permissions:
 # owner: someone
 # group: someone
 user::rw-
-user:John:rwx
+user:john:rwx
 group::r--
 mask::rwx
 other::r--
 ```
 
-Change permissions for user John:
+Change permissions for user john:
 
 ```code
-# setfacl -m "u:John:r-x" abc
+# setfacl -m "u:john:r-x" abc
 ```
 
 Check permissions:
@@ -46,7 +46,7 @@ Check permissions:
 # owner: someone
 # group: someone
 user::rw-
-user:John:r-x
+user:john:r-x
 group::r--
 mask::r-x
 other::r--