docsite: bump antsibull-docs, reference collection env var index (#79666)

docs/docsite/rst/installation_guide/intro_configuration.rst

@@ -44,7 +44,7 @@ Environmental configuration
 Ansible also allows configuration of settings using environment variables.
 If these environment variables are set, they will override any setting loaded from the configuration file.
 
-You can get a full listing of available environment variables from :ref:`ansible_configuration_settings`.
+You can get a full listing of available environment variables for configuring core functionality from :ref:`ansible_configuration_settings`, and for configuring plugins in collections from :ref:`list_of_collection_env_vars`.
 
 
 .. _command_line_configuration:

docs/templates/config.rst.j2

@@ -207,9 +207,13 @@ you can use the command line utility mentioned above (`ansible-config`) to brows
 
 {%   endfor %}
 
+.. _list_of_ansible_env_vars:
+
 Environment Variables
 =====================
 
+Other environment variables to configure plugins in collections can be found in :ref:`list_of_collection_env_vars`.
+
 .. envvar:: ANSIBLE_CONFIG
 
 

test/sanity/code-smell/docs-build.requirements.in

@@ -6,4 +6,4 @@ sphinx-notfound-page
 sphinx-ansible-theme
 straight.plugin
 rstcheck < 4  # match version used in other sanity tests
-antsibull-docs == 1.7.3  # currently approved version
+antsibull-docs == 1.9.0  # currently approved version

test/sanity/code-smell/docs-build.requirements.txt

@@ -5,7 +5,7 @@ aiosignal==1.2.0
 alabaster==0.7.12
 ansible-pygments==0.1.1
 antsibull-core==1.2.0
-antsibull-docs==1.7.3
+antsibull-docs==1.9.0
 async-timeout==4.0.2
 asyncio-pool==0.6.0
 attrs==22.1.0