Fix double dot (#2972)

docs/conf.py

@@ -31,7 +31,7 @@
 project = "Scanpy"
 author = "Scanpy development team"
 repository_url = "https://github.com/scverse/scanpy"
-copyright = f"{datetime.now():%Y}, the Scanpy development team."
+copyright = f"{datetime.now():%Y}, the Scanpy development team"
 version = scanpy.__version__.replace(".dirty", "")
 
 # Bumping the version updates all docs, so don't do that