update extensions doc (#593)

* update extensions doc

* Update examples-and-extensions.md

* Update examples-and-extensions.md

docs/src/main/paradox/examples-and-extensions.md

@@ -7,14 +7,19 @@
 If you are aware of any interesting examples that use Apache Pekko HTTP, please notify us or create a PR to modify this page.
 
 ## Extensions
-There are several [third party libraries](https://doc.akka.io/docs/akka-http/10.2/extensions.html) that expand the functionality of Akka HTTP.
+There are several third party libraries that expand the functionality of Apache Pekko HTTP including:
 
-Some that support Apache Pekko HTTP include:
-
-- [aws-spi-pekko-http](https://github.com/pjfanning/aws-spi-pekko-http): Provides a non-blocking HTTP Client that works with the [AWS Java SDK v2](https://github.com/aws/aws-sdk-java-v2).
+- [aws-spi-pekko-http](https://github.com/pjfanning/aws-spi-pekko-http): Provides a non-blocking HTTP Client that works with the [AWS Java SDK v2](https://github.com/aws/aws-sdk-java-v2). This project is now part of [Pekko Connectors](https://pekko.apache.org/docs/pekko-connectors/current/) starting with v1.1.0.
 - [pekko-http-json](https://github.com/pjfanning/pekko-http-json): Integrate some of the best JSON libs in Scala with Pekko HTTP.
 - [pekko-streams-circe/pekko-http-json](https://github.com/mdedetrich/pekko-streams-circe): Includes streaming [Circe](https://circe.github.io/circe/) support that can be used with Pekko HTTP.
 - [swagger-pekko-http](https://github.com/swagger-akka-http/swagger-pekko-http): A Scala/Java library for generating Open API (a.k.a. Swagger) from annotated Pekko HTTP code.
+- [Guardrail](https://github.com/guardrail-dev/guardrail): Guardrail is a code generation tool, capable of reading from OpenAPI/Swagger specification files and generating Pekko HTTP code
+- [akka-http-session](https://github.com/softwaremill/akka-http-session): Web & mobile client-side pekko-http sessions, with optional JWT support (supports Akka and Pekko).
+- [sttp](https://github.com/softwaremill/sttp): Library that provides a clean, programmer-friendly API to define HTTP requests and execute them using one of the wrapped backends, pekko-http among them.
+- [tapir](https://github.com/softwaremill/tapir): Tapir is a library to describe HTTP APIs, expose them as a server, consume as a client, and automatically document using open standards. Pekko HTTP is one supported backend.
+- [pekko-http-metrics](https://github.com/rustedbones/pekko-http-metrics) Easily collect and expose metrics in your pekko-http server.
+
+@ref:[pekko-http-cors](common/cors.md) was previously an independent library that has now been included in Pekko HTTP.
 
 If you are aware of any extensions that support Apache Pekko HTTP, please notify us or create a PR to modify this page.