move whatsnew; minor test fixes (pandas-dev#16209)

Author: Joseph Wagner

doc/source/whatsnew/v0.20.2.txt

@@ -51,6 +51,7 @@ I/O
 
 - Bug that would force importing of the clipboard routines unnecessarily, potentially causing an import error on startup (:issue:`16288`)
 
+- Bug in ``HDFStore.select_as_multiple()`` where start/stop arguments were not respected (:issue:`16209`)
 
 Plotting
 ^^^^^^^^

doc/source/whatsnew/v0.21.0.txt

@@ -82,7 +82,6 @@ Indexing
 I/O
 ^^^
 
-- Bug in ``HDFStore.select_as_multiple()`` where start/stop arguments were not respected (:issue:`16209`)
 
 
 Plotting

pandas/tests/io/test_pytables.py

@@ -4188,6 +4188,7 @@ def test_start_stop_table(self):
 
     def test_start_stop_multiple(self):
 
+        # GH 16209
         with ensure_clean_store(self.path) as store:
 
             df = DataFrame({"foo": [1, 2], "bar": [1, 2]})
@@ -4197,7 +4198,7 @@ def test_start_stop_multiple(self):
             result = store.select_as_multiple(['selector', 'data'],
                                               selector='selector', start=0,
                                               stop=1)
-            expected = df[['foo', 'bar']].iloc[[0]]
+            expected = df.loc[[0], ['foo', 'bar']]
             tm.assert_frame_equal(result, expected)
 
     def test_start_stop_fixed(self):