docs: list filters in corresponding arch subdomain

Author: mariajgrimaldi

docs/reference/architecture-subdomains.rst

@@ -23,6 +23,8 @@ Here we list useful information about Open edX architecture subdomains and their
 - `Subdomains from OEP-41`_
 - `Message Content Data Guidelines`_
 
+.. note:: When creating new filters in a new subdomain, please list the subdomain in this document and in :doc:`filters`.
+
 .. _Events Naming and Versioning: https://github.com/openedx/openedx-events/blob/main/docs/decisions/0002-events-naming-and-versioning.rst#L1
 .. _edX Domain Driven Design documentation: https://openedx.atlassian.net/wiki/spaces/AC/pages/213910332/Domain-Driven+Design
 .. _`Subdomains from OEP-41`: https://docs.openedx.org/projects/openedx-proposals/en/latest/architectural-decisions/oep-0041-arch-async-server-event-messaging.html#subdomain-from-domain-driven-design

docs/reference/filters.rst

@@ -6,5 +6,14 @@ This is the list of Open edX Filters found in this repository.
 .. note::
     Filters can be created in other projects and plugins as well, but these default filters are guaranteed to exist.
 
+Learning Subdomain
+------------------
+
 .. automodule:: openedx_filters.learning.filters
    :members:
+
+Course Authoring Subdomain
+--------------------------
+
+.. automodule:: openedx_filters.course_authoring.filters
+   :members: