DOCSP-44627: Add retry information (#132)

Author: norareidy

source/fundamentals/transactions.txt

@@ -94,9 +94,13 @@ describes these methods:
          transaction was committed or ended.
 
    * - ``and_run()``
-     - | Runs the given callback, then commits or ends the transaction. When you
-         use this method to perform a transaction, the driver automatically
-         handles any errors, so you can choose to omit error handling code.
+     - | Runs the given callback, then commits or ends the transaction. The
+         driver retries callbacks and commits that raise an error with a
+         ``TRANSIENT_TRANSACTION_ERROR`` label. If they raise any
+         other error, the driver ends the transaction and returns the error
+         to the caller. When you use this method to perform a transaction,
+         the driver automatically handles any errors, so you can choose to omit
+         error handling code.
        |
        | Because the callback returns a future and can be run multiple
          times, the Rust language closure borrowing rules for captured