Updates for jsonpatch.md

Fixes #36419 

- Replace references to T with TModel
- Replace "Action method code" section with Minimal APIs PATCH endpoint
- Replace "Action method code" section with Minimal APIs PATCH endpoint
- Update the "Get the code" section
-Update "Additional resources" source code link

Author: wadepickett

aspnetcore/web-api/jsonpatch.md

@@ -57,7 +57,7 @@ To enable JSON Patch support with <xref:System.Text.Json>, install the [`Microso
 dotnet add package Microsoft.AspNetCore.JsonPatch.SystemTextJson
 ```
 
-This package provides a <xref:Microsoft.AspNetCore.JsonPatch.SystemTextJson.JsonPatchDocument%601> class to represent a JSON Patch document for objects of type `T` and custom logic for serializing and deserializing JSON Patch documents using <xref:System.Text.Json>. The key method of the <xref:Microsoft.AspNetCore.JsonPatch.SystemTextJson.JsonPatchDocument%601> class is <xref:Microsoft.AspNetCore.JsonPatch.SystemTextJson.JsonPatchDocument.ApplyTo(System.Object)>, which applies the patch operations to a target object of type `T`.
+This package provides a <xref:Microsoft.AspNetCore.JsonPatch.SystemTextJson.JsonPatchDocument%601> class to represent a JSON Patch document for objects of type `TModel` and custom logic for serializing and deserializing JSON Patch documents using <xref:System.Text.Json>. The key method of the <xref:Microsoft.AspNetCore.JsonPatch.SystemTextJson.JsonPatchDocument%601> class is <xref:Microsoft.AspNetCore.JsonPatch.SystemTextJson.JsonPatchDocument.ApplyTo(System.Object)>, which applies the patch operations to a target object of type `TModel`.
 
 ## Action method code applying JSON Patch