[4.2.x] Corrected example in CreateCollation() docs.

Backport of 4db33e96d1 from main

docs/ref/contrib/postgres/operations.txt

@@ -128,9 +128,10 @@ For example, to create a collation for German phone book ordering::
 
         operations = [
             CreateCollation(
-                "german_phonebook",
+                "case_insensitive",
                 provider="icu",
                 locale="und-u-ks-level2",
+                deterministic=False,
             ),
             ...,
         ]