Update packaging examples

- pyproject.toml needs to be listed first, as it is the standard
- fix inconsistency in the project.entry-points section of
  pyproject.toml

cep-4.md

@@ -39,34 +39,10 @@ def conda_subcommands():
     ...
 ```
 
-### Entry point namespace utilizing a `setup.py` file
-
-Below is an example of an entry point namespace for the custom plugin function, decorated with the plugin hook shown above:
-
-_setup.py_
-```python
-from setuptools import setup
-
-setup(
-    name="my-conda-plugin",
-    install_requires="conda",
-    entry_points={"conda": ["my-conda-plugin = my_plugin"]},
-    py_modules=["my_plugin"],
-)
-```
-
 ### Packaging via a `pyproject.toml` file
 
 
-Below is a different packaging example that configures `setuptools` using a `pyproject.toml` file:
-
-_setup.py_
-```python
-import setuptools
-
-if __name__ == "__main__":
-    setuptools.setup()
-```
+Below is an example that configures `setuptools` using a `pyproject.toml` file (note that the `setup.py` file is optional if a `pyproject.toml` file is defined):
 
 _pyproject.toml_
 ```toml
@@ -76,12 +52,30 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "my-conda-plugin"
+version = "1.0.0"
 description = "My conda plugin"
 requires-python = ">=3.7"
 dependencies = ["conda"]
 
 [project.entry-points."conda"]
-my-conda-plugin = "my_plugin.module:function"
+my-conda-plugin = "my_plugin"
+```
+
+
+### Packaging via a `setup.py` file
+
+Below is an example of an entry point namespace for the custom plugin function, decorated with the plugin hook shown in the "Hook" section above:
+
+_setup.py_
+```python
+from setuptools import setup
+
+setup(
+    name="my-conda-plugin",
+    install_requires="conda",
+    entry_points={"conda": ["my-conda-plugin = my_plugin"]},
+    py_modules=["my_plugin"],
+)
 ```