small copy edit to last paragraph

Signed-off-by: kay <[email protected]>

Author: TimSlavinMongoDB

source/core/authorization.txt

@@ -137,7 +137,7 @@ MongoDB stores role and user data in the protected
 which are only accessible using the :ref:`user management methods
 <user-management-methods>`.
 
-If you disable access control, **do not** to modify the
+If you disable access control, **do not** modify the
 :data:`admin.system.roles` and :data:`admin.system.users` collections
 using normal :method:`~db.collection.insert()` and
 :method:`~db.collection.update()` operations.