[skip e2e] Fix typos in test comments (#15059)

Signed-off-by: NBinbin Lv <binbin.lv@zilliz.com>

tests/python_client/testcases/test_partition_20.py

@@ -567,7 +567,7 @@ class TestPartitionOperations(TestcaseBase):
         method: 1. create a partition
                 2. insert same data
                 3. create an index
-                5. drop the partition
+                4. drop the partition
         expected: drop successfully
         """
         # create collection