Added PR reference

Author: KoenZomers

CHANGELOG.md

@@ -50,7 +50,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Added `Get-PnPFileRetentionLabel` cmdlet to fetch the file retention labels. [#4603](https://github.com/pnp/powershell/pull/4603)
 - Added `Get/Set/Remove-PnPUserProfilePhoto` cmdlets to download, upload or remove the profile photo of the specified user.
 - Added `New/Get/Remove/Update-PnPTodoList` cmdlets to manage Todo lists.
-- Added `Get-PnPFileCheckedOut` cmdlet to retrieve all files that are currently checked out in a library
+- Added `Get-PnPFileCheckedOut` cmdlet to retrieve all files that are currently checked out in a library [#4682](https://github.com/pnp/powershell/pull/4682)
 
 ### Changed