Add note about dropping Python 3.7 for kafka and impala (#32017)

diff --git a/airflow/providers/apache/impala/CHANGELOG.rst b/airflow/providers/apache/impala/CHANGELOG.rst
index d84f260..8648756 100644
--- a/airflow/providers/apache/impala/CHANGELOG.rst
+++ b/airflow/providers/apache/impala/CHANGELOG.rst
@@ -15,10 +15,17 @@
     specific language governing permissions and limitations
     under the License.
 
+.. NOTE TO CONTRIBUTORS:
+   Please, only add notes to the Changelog just below the "Changelog" header when there are some breaking changes
+   and you want to add an explanation to the users on how they are supposed to deal with them.
+   The changelog is updated and maintained semi-automatically by release manager.
 
 Changelog
 ---------
 
+.. note::
+  This release dropped support for Python 3.7
+
 1.1.0
 .....
 
diff --git a/airflow/providers/apache/kafka/CHANGELOG.rst b/airflow/providers/apache/kafka/CHANGELOG.rst
index 1907f1b..4fa3601 100644
--- a/airflow/providers/apache/kafka/CHANGELOG.rst
+++ b/airflow/providers/apache/kafka/CHANGELOG.rst
@@ -15,10 +15,17 @@
     specific language governing permissions and limitations
     under the License.
 
+.. NOTE TO CONTRIBUTORS:
+   Please, only add notes to the Changelog just below the "Changelog" header when there are some breaking changes
+   and you want to add an explanation to the users on how they are supposed to deal with them.
+   The changelog is updated and maintained semi-automatically by release manager.
 
 Changelog
 ---------
 
+.. note::
+  This release dropped support for Python 3.7
+
 1.1.0
 .....