Move PoolClearedError test to a proper section (#1779)

Author: comandeo-mongo

source/transactions/tests/README.md

@@ -73,8 +73,10 @@ driver, use command monitoring instead.
         assert len(addresses) > 1
     ```
 
-3. Test that `PoolClearedError` has `TransientTransactionError` label. Since there is no simple way to trigger
-    `PoolClearedError`, this test should be implemented in a way that suites each driver the best.
+## PoolClearedError Prose Test
+
+Test that `PoolClearedError` has `TransientTransactionError` label. Since there is no simple way to trigger
+`PoolClearedError`, this test should be implemented in a way that suites each driver the best.
 
 ## Options Inside Transaction Prose Tests.
 
@@ -96,6 +98,7 @@ these tests do not run against a standalone server.
 
 ## Changelog
 
+- 2025-03-31: Move PoolClearedError tests to its own section.
 - 2025-03-27: Clarify server versions and collection creation for prose test
 - 2024-10-31: Add test for PoolClearedError.
 - 2024-02-15: Migrated from reStructuredText to Markdown.