PYTHON-3674 Simplify transaction options in convenient API doc example code (#2230)

Author: blink1073

test/asynchronous/test_examples.py

@@ -1163,12 +1163,7 @@ async def callback(session):
         # Step 2: Start a client session.
         async with client.start_session() as session:
             # Step 3: Use with_transaction to start a transaction, execute the callback, and commit (or abort on error).
-            await session.with_transaction(
-                callback,
-                read_concern=ReadConcern("local"),
-                write_concern=wc_majority,
-                read_preference=ReadPreference.PRIMARY,
-            )
+            await session.with_transaction(callback)
 
         # End Transactions withTxn API Example 1
 

test/test_examples.py

@@ -1161,12 +1161,7 @@ def callback(session):
         # Step 2: Start a client session.
         with client.start_session() as session:
             # Step 3: Use with_transaction to start a transaction, execute the callback, and commit (or abort on error).
-            session.with_transaction(
-                callback,
-                read_concern=ReadConcern("local"),
-                write_concern=wc_majority,
-                read_preference=ReadPreference.PRIMARY,
-            )
+            session.with_transaction(callback)
 
         # End Transactions withTxn API Example 1