Adds box.schema.user.enable and box.schema.user.disable methods description to Submodule box.schema

2 new files ("user_enable.rst" and user_disable.rst") added to the box.schema submodule.
Files describe methods that activate and deactivate users.
References added to existing files ("box_schema.rst", "user_grant.rst", "user_revoke.rst"
Fixes #5122

Author: AArdeev

doc/reference/reference_lua/box_schema.rst

@@ -53,6 +53,12 @@ Below is a list of all ``box.schema`` functions.
         *  - :doc:`./box_schema/user_revoke`
            - Revoke privileges from a user or a role
 
+        *  - :doc:`./box_schema/user_enable`
+           - Activate previously deactivated user
+
+        *  - :doc:`./box_schema/user_disable`
+           - Deactivate user
+
         *  - :doc:`./box_schema/user_password`
            - Get a hash of a user's password
 
@@ -105,6 +111,8 @@ Below is a list of all ``box.schema`` functions.
     box_schema/user_exists
     box_schema/user_grant
     box_schema/user_revoke
+    box_schema/user_enable
+    box_schema/user_disable
     box_schema/user_password
     box_schema/user_passwd
     box_schema/user_info

doc/reference/reference_lua/box_schema/user_disable.rst

@@ -0,0 +1,30 @@
+.. _box_schema-user_disable:
+
+===============================================================================
+box.schema.user.enable()
+===============================================================================
+
+.. module:: box.schema
+
+.. function:: box.schema.user.disable(username)
+
+    Deactivate a user. If :samp:`'{username}'` does not exist, an error is returned.
+
+    :param string username: the name of a user to be deactivated
+ 
+    :return: (if success) ``---``
+
+             (if failure) ``error: 'User '{username}' doesn''t exist'``
+
+    **Example:**
+
+        ..  code-block:: lua
+
+            box.schema.user.disable (username)
+            
+            ---
+
+    **Variation:** instead of :samp:`box.schema.user.disable('{username}')`, say
+    :samp:`box.schema.user.revoke('{username}','usage,session','universe',nil,` :code:`{if_exists=true})`
+    (see section :ref:`box.schema.user.revoke <box_schema-user_revoke>`).
+   

doc/reference/reference_lua/box_schema/user_enable.rst

@@ -0,0 +1,27 @@
+.. _box_schema-user_enable:
+
+===============================================================================
+box.schema.user.enable()
+===============================================================================
+
+.. module:: box.schema
+
+.. function:: box.schema.user.enable(username)
+
+    Activate deactivated user. If :samp:`'{username}'` does not exist, it will be created. If :samp:`'{username}'` is already active, nothing changes.
+
+    :param string username: the name of a user to be activated
+ 
+    :return: ``---``
+
+    **Example:**
+
+        ..  code-block:: lua
+
+            box.schema.user.enable (username)
+            
+            ---
+
+    **Variation:** instead of :samp:`box.schema.user.enable('{username}')`, say
+    :samp:`box.schema.user.grant('{username}','usage,session','universe',nil,` :code:`{if_not_exists=true})`
+    (see section :ref:`box.schema.user.grant <box_schema-user_grant>`).

doc/reference/reference_lua/box_schema/user_grant.rst

@@ -31,7 +31,7 @@ box.schema.user.grant()
 
     **Variation:** instead of
     :samp:`box.schema.user.grant('{username}','usage,session','universe',nil,` :code:`{if_not_exists=true})`
-    say :samp:`box.schema.user.enable('{username}')`.
+    say :samp:`box.schema.user.enable('{username}')` (see section :ref:`box.schema.user.enable <box_schema-user_enable>`).
 
     The possible options are:
 

doc/reference/reference_lua/box_schema/user_revoke.rst

@@ -31,7 +31,7 @@ box.schema.user.revoke()
 
     **Variation:** instead of
     :samp:`box.schema.user.revoke('{username}','usage,session','universe',nil,` :code:`{if_exists=true})`
-    say :samp:`box.schema.user.disable('{username}')`.
+    say :samp:`box.schema.user.disable('{username}')` (see section :ref:`box.schema.user.disable <box_schema-user_disable>`).
 
     **Example:**