Fixed #36485 -- Added lint-docs check in Tox and GitHub Actions.

The `check` docs target now runs spelling, black, and lint, so all
current documentation quality checks can be run with a single command.

Also documented the lint-docs check's availability and usage.

1 files changed, 6 insertions, 5 deletions

diff --git a/docs/internals/contributing/writing-code/unit-tests.txt b/docs/internals/contributing/writing-code/unit-tests.txt
index 05b2bf09c6..b4bc429af5 100644
--- a/docs/internals/contributing/writing-code/unit-tests.txt
+++ b/docs/internals/contributing/writing-code/unit-tests.txt
@@ -69,11 +69,11 @@ command from any place in the Django source tree:
     $ tox
 
 By default, ``tox`` runs the test suite with the bundled test settings file for
-SQLite, ``black``, ``blacken-docs``, ``flake8``, ``isort``, and the
-documentation spelling checker. In addition to the system dependencies noted
-elsewhere in this documentation, the command ``python3`` must be on your path
-and linked to the appropriate version of Python. A list of default environments
-can be seen as follows:
+SQLite, ``black``, ``blacken-docs``, ``flake8``, ``isort``, ``lint-docs`` and
+the documentation spelling checker. In addition to the system dependencies
+noted elsewhere in this documentation, the command ``python3`` must be on your
+path and linked to the appropriate version of Python. A list of default
+environments can be seen as follows:
 
 .. console::
 
@@ -84,6 +84,7 @@ can be seen as follows:
     flake8>=3.7.0
     docs
     isort>=5.1.0
+    lint-docs
 
 Testing other Python versions and database backends
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~