enabled config for semantic models (#4219)

related to: #3997
related to: #4281

## What are you changing in this pull request and why?
- Add an example for config in `dbt_project.yml`
- Match the style for other resource types for
`models/semantic_models.yml`
- Simplify the definition by removing the explicit listing of applicable
resource types
- rather than bring it up-to-date by adding sources, metrics, and
exposures

## 🎩 

### Previews
-
[1.6](https://docs-getdbt-com-git-dbeatty-semantic-models-ena-f0b17e-dbt-labs.vercel.app/reference/resource-configs/enabled?version=1.6)
-
[1.7](https://docs-getdbt-com-git-dbeatty-semantic-models-ena-f0b17e-dbt-labs.vercel.app/reference/resource-configs/enabled?version=1.7)

### v1.7

<img width="500" alt="image"
src="https://github.com/dbt-labs/docs.getdbt.com/assets/44704949/c63a2128-77c6-48ec-b498-76e1e5f6d02b">

## Checklist
- [x] I have tested that the code examples work
- [x] I have tested that the changes look correct in the Vercel preview
- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
and [About
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
so my content adheres to these guidelines.

Author: matthewshaver

website/docs/reference/resource-configs/enabled.md

@@ -261,20 +261,26 @@ Support for disabling semantic models has been added in dbt Core v1.7
 
 <VersionBlock firstVersion="1.7">
 
-<File name='semantic_models.yml'>
-
-```yml
-semantic_models:
-  - name: semantic_people
-    model: ref('people')
-    config:
-      enabled: false
+<File name='dbt_project.yml'>
 
+```yaml
+semantic-models:
+  [<resource-path>](/reference/resource-configs/resource-path):
+    [+](/reference/resource-configs/plus-prefix)enabled: true | false
 ```
 
 </File>
 
-The `enabled` configuration can be nested under the `config` key.
+<File name='models/semantic_models.yml'>
+
+```yaml
+semantic_models:
+  - name: [<semantic_model_name>]
+    [config](/reference/resource-properties/config):
+      enabled: true | false
+```
+
+</File>
 
 </VersionBlock>
 
@@ -283,7 +289,7 @@ The `enabled` configuration can be nested under the `config` key.
 </Tabs>
 
 ## Definition
-An optional configuration for disabling models, seeds, snapshots, tests, and semantic models.
+An optional configuration for enabling or disabling a resource.
 
 * Default: true