Update docs/federation.md

Co-authored-by: Louis Fisher <[email protected]>

docs/federation.md

@@ -109,7 +109,7 @@ _Clinical coding of long COVID in English primary care: a federated analysis of
 British Journal of General Practice - [https://doi.org/10.3399/BJGP.2021.0301](https://doi.org/10.3399/BJGP.2021.0301)
 
 _Eleven key measures for monitoring general practice clinical activity during COVID-19 using federated analytics on 48 million adults' primary care records through OpenSAFELY_
-MedRxiv Preprint - [https://doi.org/10.7554/eLife.84673](https://doi.org/10.7554/eLife.84673)
+eLife - [https://doi.org/10.7554/eLife.84673](https://doi.org/10.7554/eLife.84673)
 
 _The impact of the COVID-19 pandemic on Antipsychotic Prescribing in individuals with autism, dementia, learning disability, serious mental illness or living in a care home: A federated analysis of 59 million patients' primary care records in situ using OpenSAFELY_
 MedRxiv Preprint - [https://doi.org/10.1101/2023.01.05.23284214](https://doi.org/10.1101/2023.01.05.23284214)