Update plugins.rst examples to use pyproject.toml over setup.py (apac…

…he#39665)

* Update plugins.rst examples to use pyproject.toml over setup.py

pyproject.toml is the standard project description moving forward. Airflow has itself adopted this recently.
Examples should follow this to ease using the latest standard for plugin authors.

https://packaging.python.org/en/latest/discussions/setup-py-deprecated/#is-pyproject-toml-mandatory

* Add toml and pyproject into spelling_wordlist.txt

---------

Co-authored-by: Andrey Anshin <Andrey.Anshin@taragol.is>

docs/apache-airflow/authoring-and-scheduling/plugins.rst

@@ -309,15 +309,12 @@ will automatically load the registered plugins from the entrypoint list.
         name = "my_namespace"
         flask_blueprints = [bp]
 
-.. code-block:: python
+Then inside pyproject.toml:
 
-    from setuptools import setup
+.. code-block:: toml
 
-    setup(
-        name="my-package",
-        # ...
-        entry_points={"airflow.plugins": ["my_plugin = my_package.my_plugin:MyAirflowPlugin"]},
-    )
+    [project.entry-points."airflow.plugins"]
+    my_plugin = "my_package.my_plugin:MyAirflowPlugin"
 
 Automatic reloading webserver
 -----------------------------

docs/spelling_wordlist.txt

@@ -1279,6 +1279,7 @@ pymysql
 pyodbc
 pypa
 PyPI
+pyproject
 pypsrp
 pyspark
 pytest
@@ -1655,6 +1656,7 @@ todo
 tokenization
 tokopedia
 tolerations
+toml
 toolchain
 Tooltip
 tooltip