fix PR number

Author: pdurbin

doc/release-notes/6.10.1-release-notes.md

@@ -1,6 +1,6 @@
 # Dataverse 6.10.1
 
-This is a bug fix release for Dataverse 6.10 that fixes download bug #12251 that was fixed in pull request #12251. The bug caused single-file downloads (as opposed to multi-file zip download) to silently fail from the web interface (the API was unaffected).
+This is a bug fix release for Dataverse 6.10 that fixes download bug #12251 that was fixed in pull request #12252. The bug caused single-file downloads (as opposed to multi-file zip download) to silently fail from the web interface (the API was unaffected).
 
 ## Complete List of Changes