update easy cozy known errors

docs/easycozy/known_errors.md

 # Oops...
 
-Sometime the stack is stuck when we reset several instance due to rabbit mq process. The following screen is then obtain:
+Sometime the stack is stuck when we reset several instances due to rabbit mq process. The following screen is then obtain when trying to access to an instance:
 ![oops_error](/img/known_errors/oops_error.png)
 
-On the server we can see that the server is underwater by using "top" command:
+On the server, we can see that the server is underwater by using "top" command:
 ![oops_error_1](/img/known_errors/oops_error_1.png)
 
-To fix the issue you can just restart the service with "docker-compose down / docker-compose up -d" in the easy-cozy folder:
+To fix the issue you can just restart the service on the server with "docker-compose down / docker-compose up -d" in the easy-cozy folder:
 ![oops_error_2](/img/known_errors/oops_error_2.png)
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