Add tiers to security password doc pages

doc/security/password_length_limits.md

@@ -5,12 +5,12 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 type: reference, howto
 ---
 
-# Custom password length limits
+# Custom password length limits **(FREE SELF)**
 
-By default, GitLab supports passwords with:
+By default, GitLab supports passwords with the following lengths:
 
-- A minimum length of 8.
-- A maximum length of 128.
+- Minimum: 8 characters
+- Maximum: 128 characters
 
 GitLab administrators can modify password lengths:
 
@@ -29,11 +29,12 @@ The user password length is set to a minimum of 8 characters by default.
 
 To change the minimum password length using GitLab UI:
 
-1. Go to **Admin Area > Settings**, then select **Sign-up restrictions**.
+1. Go to the Admin Area (**{admin}**) and select **Settings > Sign-up restrictions**.
 
    ![Minimum password length settings](../user/admin_area/img/minimum_password_length_settings_v12_6.png)
 
-1. Input a **Minimum password length** value greater than or equal to 8, then select **Save changes**.
+1. Enter a **Minimum password length** value greater than or equal to `8`.
+1. Select **Save changes**.
 
 ## Modify maximum password length using configuration file
 

doc/security/password_storage.md

 ---
-stage: none
-group: unassigned
+stage: Manage
+group: Access
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 type: reference
 ---
 
-# Password Storage
+# Password storage **(FREE)**
 
 GitLab stores user passwords in a hashed format, to prevent passwords from being visible.
 

doc/security/passwords_for_integrated_authentication_methods.md

@@ -5,7 +5,7 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 type: reference
 ---
 
-# Generated passwords for users created through integrated authentication
+# Generated passwords for users created through integrated authentication **(FREE)**
 
 GitLab allows users to set up accounts through integration with external [authentication and authorization providers](../administration/auth/README.md).