Typo

Co-Authored-By: David Wood <in@davidtw.co>

Author: oli-obk

working-groups/diagnostics/README.md

@@ -7,7 +7,7 @@ why the compiler isn’t smart enough to understand their code yet.
 - **Leads:** [@oli-obk][oli-obk] [@estebank][estebank]
 - **Meeting Notes:** [All](NOTES.md)
 
-[oli-okb]: https://github.com/oli-obk
+[oli-obk]: https://github.com/oli-obk
 [estebank]: https://github.com/estebank
 [status]: https://img.shields.io/badge/status-active-brightgreen.svg?style=for-the-badge