Credit Raimund Hook as author of Paired Onboarding Sprint

The pattern is a write-up of his ISC talk describing GitLab's
Co-create program; asking him to review and sign off in the PR.

Author: rrrutledge

patterns/1-initial/paired-onboarding-sprint.md

@@ -54,7 +54,7 @@ GitLab treats this as one piece of a broader respect for a contributor's time: a
 
 ## Authors
 
-* TBD
+* Raimund Hook
 
 ## Related Patterns