Merge revs 40617 and 40739 from ZODB trunk.

Repair typo in exception message.

src/ZODB/serialize.py

@@ -340,7 +340,7 @@ class ObjectWriter:
             if self._jar.get_connection(database_name) is not obj._p_jar:
                 raise InvalidObjectReference(
                     "Attempt to store a reference to an object from "
-                    "a separate onnection to the same database or "
+                    "a separate connection to the same database or "
                     "multidatabase"
                     )
 

src/ZODB/tests/testcrossdatabasereferences.py

@@ -56,7 +56,7 @@ database open function, but this doesn't work:
     Traceback (most recent call last):
     ...
     InvalidObjectReference: Attempt to store a reference to an object
-    from a separate onnection to the same database or multidatabase
+    from a separate connection to the same database or multidatabase
 
     >>> tm.abort()
 
@@ -72,7 +72,7 @@ different connections to the same database.
     Traceback (most recent call last):
     ...
     InvalidObjectReference: Attempt to store a reference to an object
-    from a separate onnection to the same database or multidatabase
+    from a separate connection to the same database or multidatabase
 
     >>> tm.abort()