Add subscription docs

CHANGELOG.md

@@ -10,6 +10,7 @@ All notable changes to this project will be documented in this file.
 ### Added
 
 - Release instructions to README.
+- Subscription management docs.
 
 ### Fixed
 

docs/src/index.rst

@@ -29,6 +29,13 @@ CriticalUp User Documentation
    using-criticalup/toolchain-management
    using-criticalup/running-tools
 
+.. toctree::
+   :numbered:
+   :maxdepth: 2
+   :caption: Ferrocene Subscription:
+
+   subscriptions
+
 .. toctree::
    :numbered:
    :maxdepth: 2

docs/src/overview.rst

@@ -20,6 +20,7 @@ This guide contains the following chapters:
   CriticalUp.
 * *Using CriticalUp* describes how to use CriticalUp to manage Ferrocene
   installations.
+* *Managing Subscriptions* describes how to manage your subscription.
 * *References* provides further support and information about other
   documentation.
 

docs/src/subscriptions.rst

@@ -0,0 +1,13 @@
+.. SPDX-FileCopyrightText: The Ferrocene Developers
+.. SPDX-License-Identifier: MIT OR Apache-2.0
+
+.. _subscriptions:
+
+Managing Subscriptions
+======================
+
+This chapter describes how to make changes to your Ferrocene subscription.
+
+- If you subscribed to Ferrocene with a credit card, you can make changes to your subscription in your `Billing Portal <https://customers.ferrocene.dev/stripe/billing>`_.
+
+- If you have an Enterprise Subscription, email your billing contact to make changes to your subscription.

docs/src/using-criticalup/authenticating.rst

@@ -9,27 +9,24 @@ Authenticating
 This chapter describes how to authenticate CriticalUp on the
 `Ferrocene Customer Portal`_.
 
-The example assumes you have a preexisting Ferrocene account. This example
-presumes no existing directory structure.
+You need a Ferrocene subscription to authenticate CriticalUp and download Ferrocene.
 
 .. _Ferrocene Customer Portal: https://customers.ferrocene.dev/
 
-After :ref:`installing CriticalUp <install>` it's possible to authenticate
-CriticalUp via the ``auth set`` subcommand.
-
+After :ref:`installing CriticalUp <install>`, authenticate by running the ``auth set`` subcommand:
 
 .. code-block::
 
    criticalup auth set
 
 Follow the on-screen instructions to generate a new token, then paste the token
-into the prompt. CriticalUp will validate that the provided token is valid.
+into the prompt. CriticalUp will validate the token.
 
 
 Check Authentication Status
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-The current authentication state and token used can be reviewed with the ``auth`` command.
+Review authentication and token state using the ``auth`` command.
 
 .. code-block::
 
@@ -39,7 +36,7 @@ The current authentication state and token used can be reviewed with the ``auth`
 Unauthenticating
 ^^^^^^^^^^^^^^^^
 
-In order to remove the authenticated token, the ``auth remove`` command can be used.
+To remove the authenticated token, run ``auth remove``.
 
 .. code-block::