doc: dev: Document previously undocumented components

Tests:

- Build HTML and ensure build succeeds that the changes are reflected.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

doc/dev/reference/components/daemon.rst

@@ -5,3 +5,6 @@ Daemon
 
 .. autoclass:: plinth.daemon.Daemon
    :members:
+
+.. autoclass:: plinth.daemon.RelatedDaemon
+   :members:

doc/dev/reference/components/enablestate.rst

@@ -0,0 +1,7 @@
+.. SPDX-License-Identifier: CC-BY-SA-4.0
+
+EnableState
+^^^^^^^^^^^
+
+.. autoclass:: plinth.app.EnableState
+   :members:

doc/dev/reference/components/index.rst

@@ -7,6 +7,7 @@ Components
    :caption: Available components:
 
    info
+   enablestate
    menu
    packages
    daemon
@@ -15,6 +16,7 @@ Components
    frontpage
    domain
    letsencrypt
+   users
    staticfiles
    backups
    coturn

doc/dev/reference/components/users.rst

@@ -0,0 +1,7 @@
+.. SPDX-License-Identifier: CC-BY-SA-4.0
+
+Users
+^^^^^
+
+.. autoclass:: plinth.modules.users.components.UsersAndGroups
+   :members:

plinth/app.py

@@ -455,7 +455,16 @@ class Info(FollowerComponent):
 
 
 class EnableState(LeaderComponent):
-    """A component to hold the enable state of an app using a simple flag."""
+    """A component to hold the enable state of an app using a simple flag.
+
+    The flag is stored in the FreedomBox service database. This component
+    should only be used if an app does not have any other way to determine if
+    it is enabled or disabled by examining the state of the system. Typical
+    apps have daemons, web server configuration, etc. and the enabled/disabled
+    state of those determine the enabled/disabled state of the entire app. If
+    an does not have any such system state, then this component may be used to
+    provide enable/disable functionality for the app.
+    """
 
     @property
     def key(self):