correct the wrong issue number

Author: charlesdong1991

doc/source/whatsnew/v0.24.0.rst

@@ -1231,7 +1231,7 @@ ways of adding operator support.
 - :meth:`Series.unstack` and :meth:`DataFrame.unstack` no longer convert extension arrays to object-dtype ndarrays. Each column in the output ``DataFrame`` will now have the same dtype as the input (:issue:`23077`).
 - Bug when grouping :meth:`Dataframe.groupby()` and aggregating on ``ExtensionArray`` it was not returning the actual ``ExtensionArray`` dtype (:issue:`23227`).
 - Bug in :func:`pandas.merge` when merging on an extension array-backed column (:issue:`23020`).
-- Bug in :func:`pandas.merge` when setting None in suffixes (:issue: `24819`).
+- Bug in :func:`pandas.merge` when setting None in suffixes (:issue: `24782`).
 
 
 .. _whatsnew_0240.deprecations:

pandas/tests/reshape/merge/test_merge.py

@@ -1517,7 +1517,7 @@ def test_merge_series(on, left_on, right_on, left_index, right_index, nm):
     ("a", 0, (None, "_y"), ["a", 0])
 ])
 def test_merge_suffix(col1, col2, suffixes, expected_cols):
-    # 24819
+    # issue: 24782
     a = pd.DataFrame({col1: [1, 2, 3]})
     b = pd.DataFrame({col2: [4, 5, 6]})
 
@@ -1531,7 +1531,7 @@ def test_merge_suffix(col1, col2, suffixes, expected_cols):
     (None, '')
 ])
 def test_merge_suffix_errors(suffixes):
-    # 24819
+    # issue: 24782
     a = pd.DataFrame({0: [1, 2, 3]})
     b = pd.DataFrame({0: [4, 5, 6]})