DOCS-3171: Add more custom API versus custom model distinction (#3709)

docs/how-tos/create-module.md

@@ -120,7 +120,7 @@ The three pieces of the API namespace triplet are as follows:
 
 In addition to determining which existing API namespace triplet to use when creating your module, you need to decide on a separate triplet unique to your model.
 
-{{< expand "API namespace triplet and model namespace triplet examples" >}}
+{{< expand "API namespace triplet and model namespace triplet example" >}}
 
 The `rand:yahboom:arm` model and the `rand:yahboom:gripper` model use the repository name [yahboom](https://github.com/viam-labs/yahboom).
 The models implement the `rdk:component:arm` and the `rdk:component:gripper` API to support the Yahboom DOFBOT arm and gripper, respectively:
@@ -136,16 +136,6 @@ The models implement the `rdk:component:arm` and the `rdk:component:gripper` API
 }
 ```
 
-The `viam-labs:audioout:pygame` model uses the repository name [audioout](https://github.com/viam-labs/audioout).
-It implements the custom API `viam-labs:service:audioout`:
-
-```json
-{
-  "api": "viam-labs:service:audioout",
-  "model": "viam-labs:audioout:pygame"
-}
-```
-
 {{< /expand >}}
 
 A resource model is identified by a unique name, called the {{< glossary_tooltip term_id="model-namespace-triplet" text="model namespace triplet" >}}, using the format: `namespace:repo-name:model-name`, where:
@@ -1224,7 +1214,7 @@ When packaged in this fashion, you can run the resulting executable on your desi
 To create a packaged executable:
 
 1. First, [create a Python virtual environment](/sdks/python/python-venv/) in your module's directory to ensure your module has access to any required libraries.
-   Be sure you are within your Python virtual environment for the rest of these steps: your terminal prompt should include the name of your virtual environment in parenthesis.
+   Be sure you are within your Python virtual environment for the rest of these steps: your terminal prompt should include the name of your virtual environment in parentheses.
 
 1. Create a `requirements.txt` file containing a list of all the dependencies your module requires.
    For example, a `requirements.txt` file with the following contents ensures that the Viam Python SDK (`viam-sdk`), PyInstaller (`pyinstaller`), and the Google API Python client (`google-api-python-client`) are installed:
@@ -1343,7 +1333,7 @@ Use the [`nuitka` Python compiler](https://pypi.org/project/Nuitka/) to compile
 1. In order to use Nuitka, you must install a [supported C compiler](https://github.com/Nuitka/Nuitka#c-compiler) on your machine.
 
 1. Then, [create a Python virtual environment](/sdks/python/python-venv/) in your module's directory to ensure your module has access to any required libraries.
-   Be sure you are within your Python virtual environment for the rest of these steps: your terminal prompt should include the name of your virtual environment in parenthesis.
+   Be sure you are within your Python virtual environment for the rest of these steps: your terminal prompt should include the name of your virtual environment in parentheses.
 
 1. Create a `requirements.txt` file containing a list of all the dependencies your module requires.
    For example, a `requirements.txt` file with the following contents ensures that the Viam Python SDK (`viam-sdk`) and Nuitka (`nuitka`) are installed:

docs/registry/advanced/create-subtype.md

@@ -39,6 +39,26 @@ The following steps guide you through this process in more detail:
    If it provides higher-level functionality, it is a service.
 1. Choose a name for your subtype.
    For example, `gizmo`.
+
+   Determine a valid {{< glossary_tooltip term_id="api-namespace-triplet" text="API namespace triplet" >}} based on your subtype name.
+   You can figure out the {{< glossary_tooltip term_id="model-namespace-triplet" text="model namespace triplet" >}} later when you [create a model that implements your custom API](/registry/advanced/create-subtype/#next-steps).
+
+   {{< expand "API namespace triplet and model namespace triplet example" >}}
+
+   The `viam-labs:audioout:pygame` model uses the repository name [audioout](https://github.com/viam-labs/audioout).
+   It implements the custom API `viam-labs:service:audioout`:
+
+   ```json
+   {
+     "api": "viam-labs:service:audioout",
+     "model": "viam-labs:audioout:pygame"
+   }
+   ```
+
+   For your custom API, your API namespace triplet might be `your-org-namespace:component:gizmo` where `your-org-namespace` is your organization namespace, found in your org settings page in the Viam app.
+
+   {{< /expand >}}
+
 1. Create a directory for your module.
    Within that, create a directory called <file>src</file>.