Update orb-init.sh

[scwheele]

Checklist

• [ x ] All new jobs, commands, executors, parameters have descriptions
• [ x ] Examples have been added for any significant new features
• [ x ] README has been updated, if necessary

Motivation, issues

Fixed a typo in the output

Description

Output said "Switching to Alhpa branch", should have said "Switching to Alpha branch".

[KyleTryon]

Thank you!