Update Request_to_join.md

.gitlab/merge_request_templates/Request_to_join.md

-Thanks for joining librehosters!
+Thanks for applying to join librehosters!
 
-One more thing, can you please share a link to:
+Please share a link to:
 
- - the git of your infra (Or detail a bit what you are using)
- - the thread of your presentation on the [forum](https://talk.libreho.st/)
+ - the git repositories of your infrastructure (or detail a bit what you are using)
+ - the thread of your introduction on the [forum](https://talk.libreho.st/)