add read/writeanyrole to user created in enable auth + remove unused step file

Author: kay-kim

source/includes/steps-add-user-administrator.yaml

@@ -29,9 +29,14 @@ title: Create the user administrator.
 level: 4
 ref: create-user-admin
 pre: |
+
   In the ``admin`` database, add a user with the
-  :authrole:`userAdminAnyDatabase` role. For example, the following
-  creates the user ``myUserAdmin`` in the ``admin`` database:
+  :authrole:`userAdminAnyDatabase` role. Include additional roles as
+  needed for this user. For example, the following
+  creates the user ``myUserAdmin`` in the ``admin`` database with the
+  :authrole:`userAdminAnyDatabase` role and the
+  :authrole:`readWriteAnyDatabase` role.
+
 action:
   pre: |
     .. note::
@@ -48,7 +53,7 @@ action:
       {
         user: "myUserAdmin",
         pwd: "abc123",
-        roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
+        roles: [ { role: "userAdminAnyDatabase", db: "admin" }, "readWriteAnyDatabase" ]
       }
     )
 post: |
@@ -121,11 +126,6 @@ pre: |
   :doc:`user-defined roles </core/security-user-defined-roles>` to the
   users.
 
-  The ``myUserAdmin`` user only has privileges to :doc:`manage users
-  and roles </tutorial/manage-users-and-roles>`. As ``myUserAdmin``, if
-  you attempt to perform any other operations, such as read from a
-  ``foo`` collection in the ``test`` database, MongoDB returns an error.
-
 action:
   pre: |
     The following operation adds a user ``myTester`` to the ``test``