Tiny fixes/updates to github.md

Author: emiliom

resources/prep/github.md

@@ -4,7 +4,7 @@
 
 [Git](https://git-scm.com/) is a popular version control system that is the foundation of most open source software development. You are not required to be a Git pro in advance of this event, but come prepared to learn a lot about it! [GitHub](https://github.com) is a hosting service for Git repositories, enabling us to share code across teams in a web environment.
 
-We will use Git and GitHub for collaborative work. Be sure to arrive at {OceanHackWeek with your own [GitHub](https://github.com/) account.
+We will use Git and GitHub for collaborative work. Be sure to arrive at the OceanHackWeek event with your own [GitHub](https://github.com/) account.
 
 ## Why do I need a GitHub account?
 
@@ -25,7 +25,7 @@ GitHub organizations are a convenient way for teams to get all content relevant
 
 We have created a GitHub organization called oceanhackweek at [https://github.com/oceanhackweek](https://github.com/oceanhackweek). For security purposes you can only join the organization by invitation. You should already have received the invitation to GitHub. If you didn't:
 
-1. Once you have a GitHub ID, in the `#ohw22-helpdesk` Slack channel ask for help and include `@help-infrastructure` in your message so that folks who have the ability to make changes are notified.
+1. Once you have a GitHub ID, in the `#ohw23_helpdesk` Slack channel ask for help and include `@help-infrastructure` in your message so that folks who have the ability to make changes are notified.
 2. We will then send you an invitation which should generate an email notification to the email you provided when you signed up for GitHub
 3. Follow the links in the email to accept the invitation