Clarify in guidelines

COLLABORATING.md

 As a collaborator you are representing the Awesome PHP project to the community. Please adhere to the following guidelines to give everyone the best experience possible: 
 
 ## Etiquette
-Please adhere to the project's [CODE-OF-CONDUCT](https://github.com/ziadoz/awesome-php/blob/master/CODE-OF-CONDUCT.md) at all times.
+Please adhere to the [CODE-OF-CONDUCT](https://github.com/ziadoz/awesome-php/blob/master/CODE-OF-CONDUCT.md) when reviewing suggestions and participating in discussions on the project's Github account.
 
 Always be polite and thank people, even if you don’t accept their suggestions.