Fix some typo + add doc for mail and media library service

docs/architecture/services/authentication.md

@@ -22,21 +22,21 @@ The entrypoint of the service is a REST API provided by a [NestJS](https://githu
 
 ## API documentation
 
-NestJS provides a swagger module that can be easily integrated. Using specific annotations alongside your endpoints declaration, this module will automatically generates a swagger documentation, reachable at `/api-docs`.
+NestJS provides a [swagger module](https://docs.nestjs.com/recipes/swagger) that can be easily integrated. Using specific annotations alongside your endpoints declaration, this module will automatically generates a swagger documentation, reachable at `/api-doc`.
 
 ## Service health
 
-NestJS provides a [health module](https://github.com/nestjs/terminus) based on Terminus, that gives you the opportunity to declare predifined or custom health indicators. It exposes the health status of the service at `/health`.  
+NestJS provides a [health module](https://github.com/nestjs/terminus) based on Terminus, that gives you the opportunity to declare predefined or custom health indicators. It exposes the health status of the service at `/health`.  
 This service will return a `200` http status code when all indicators are healthy. Otherwise it will return a `503` http status code. 
 
-For this service we declared two health indicators that: 
+For this service we declared two health indicators that verify that: 
 * the Kong API gateway is up
 * the legacy authentication middleware is up
 
 ## Stats
 
 We are using a Node module called [swagger-stats](http://swaggerstats.io/).  
-It traces API calls, monitors API performance and usage statistics. It exposes the metrics in different formats, such as Prometheus format, so you may use Prometheus and Graphana for API monitoring and alterting.  
+It traces API calls, monitors API performance and usage statistics. It exposes the metrics in different formats, such as Prometheus format, so you may use Prometheus and Graphana for API monitoring and alerting.  
 Those metrics are available at `/swagger-stats/metrics`.
 
 For more information about this module, visit the [official swagger-stat page](http://swaggerstats.io/docs.html).