docs: "ASDF Model" should be stylized as "ASDF Pydantic model"

docs/model.md

@@ -1,6 +1,6 @@
 ```{currentmodule} asdf_pydantic
 ```
-# Writing ASDF Models to define tagged objects
+# Writing ASDF Pydantic models to define tagged objects
 
 The {py:class}`AsdfPydanticModel` is a class that combines the feature of
 [`pydantic.BaseModel`](https://docs.pydantic.dev/usage/models/) and ASDF 
@@ -17,7 +17,7 @@ class Rectangle(AsdfPydanticModel):
 This `Rectangle` model will be referenced in ASDF's YAML file as `!rectangle-1.0.0` 
 specified by the `_tag` field. `_tag` is a globally unique ASDF tag (see [naming best
 practices](https://asdf.readthedocs.io/en/stable/asdf/extending/uris.html#tags))
-that identifies the ASDF model. This model contains two fields: `width` and
+that identifies the ASDF Pydantic model. This model contains two fields: `width` and
 `height` and their field type are both `float`.
 
 ## Field Types