Add OpenAPI/SwaggerUI (#35389)

Author: guardrex

aspnetcore/blazor/security/blazor-web-app-with-entra.md

@@ -75,6 +75,8 @@ The `MinimalApiJwt` project is a backend web API for multiple frontend projects.
 
 The `MinimalApiJwt.http` file can be used for testing the weather data request. Note that the `MinimalApiJwt` project must be running to test the endpoint, and the endpoint is hardcoded into the file. For more information, see <xref:test/http-files>.
 
+The project includes packages and configuration to produce [OpenAPI documents](xref:fundamentals/openapi/overview) and the [Swagger UI](https://swagger.io/api-hub/) in the Development environment. For more information, see <xref:fundamentals/openapi/using-openapi-documents#use-swagger-ui-for-local-ad-hoc-testing>.
+
 A secure weather forecast data endpoint is in the project's `Program` file:
 
 ```csharp
@@ -283,6 +285,8 @@ The `MinimalApiJwt` project is a backend web API for multiple frontend projects.
 
 The `MinimalApiJwt.http` file can be used for testing the weather data request. Note that the `MinimalApiJwt` project must be running to test the endpoint, and the endpoint is hardcoded into the file. For more information, see <xref:test/http-files>.
 
+The project includes packages and configuration to produce [OpenAPI documents](xref:fundamentals/openapi/overview) and the [Swagger UI](https://swagger.io/api-hub/) in the Development environment. For more information, see <xref:fundamentals/openapi/using-openapi-documents#use-swagger-ui-for-local-ad-hoc-testing>.
+
 A secure weather forecast data endpoint is in the project's `Program` file:
 
 ```csharp

aspnetcore/blazor/security/blazor-web-app-with-oidc.md

@@ -114,6 +114,8 @@ The `MinimalApiJwt` project is a backend web API for multiple frontend projects.
 
 The `MinimalApiJwt.http` file can be used for testing the weather data request. Note that the `MinimalApiJwt` project must be running to test the endpoint, and the endpoint is hardcoded into the file. For more information, see <xref:test/http-files>.
 
+The project includes packages and configuration to produce [OpenAPI documents](xref:fundamentals/openapi/overview) and the [Swagger UI](https://swagger.io/api-hub/) in the Development environment. For more information, see <xref:fundamentals/openapi/using-openapi-documents#use-swagger-ui-for-local-ad-hoc-testing>.
+
 The project creates a [Minimal API](xref:fundamentals/minimal-apis) endpoint for weather data:
 
 ```csharp
@@ -439,6 +441,8 @@ The `MinimalApiJwt` project is a backend web API for multiple frontend projects.
 
 The `MinimalApiJwt.http` file can be used for testing the weather data request. Note that the `MinimalApiJwt` project must be running to test the endpoint, and the endpoint is hardcoded into the file. For more information, see <xref:test/http-files>.
 
+The project includes packages and configuration to produce [OpenAPI documents](xref:fundamentals/openapi/overview) and the [Swagger UI](https://swagger.io/api-hub/) in the Development environment. For more information, see <xref:fundamentals/openapi/using-openapi-documents#use-swagger-ui-for-local-ad-hoc-testing>.
+
 The project creates a [Minimal API](xref:fundamentals/minimal-apis) endpoint for weather data:
 
 ```csharp
@@ -824,6 +828,8 @@ The `MinimalApiJwt` project is a backend web API for multiple frontend projects.
 
 The `MinimalApiJwt.http` file can be used for testing the weather data request. Note that the `MinimalApiJwt` project must be running to test the endpoint, and the endpoint is hardcoded into the file. For more information, see <xref:test/http-files>.
 
+The project includes packages and configuration to produce [OpenAPI documents](xref:fundamentals/openapi/overview) and the [Swagger UI](https://swagger.io/api-hub/) in the Development environment. For more information, see <xref:fundamentals/openapi/using-openapi-documents#use-swagger-ui-for-local-ad-hoc-testing>.
+
 A secure weather forecast data endpoint is in the project's `Program` file:
 
 ```csharp