(DOCSP-45749) Updates nested important admonitions to unnest (#343) (#355)

Author: sarahsimpers

source/fundamentals/transactions.txt

@@ -103,15 +103,14 @@ tabs to learn about the methods to manage your transaction:
                   learn more about this method, see the :manual:`withTransaction() page
                   </reference/method/Session.withTransaction/>` in the Server manual.
 
-                .. important:: Handling Exceptions
-
-                   When catching exceptions within the callback function used by
-                   ``WithTransaction()``, you  **must** rethrow the exception before
-                   exiting the try-catch block. Failing to do so can result in an
-                   infinite loop. For further details on how to handle exceptions in this
-                   case, see :manual:`Transactions </core/transactions/>` in the Server
-                   manual and select :guilabel:`C#` from the language dropdown to view 
-                   the example.
+                :gold:`IMPORTANT:` When catching exceptions within the
+                callback function used by
+                ``WithTransaction()``, you  **must** rethrow the exception before
+                exiting the try-catch block. Failing to do so can result in an
+                infinite loop. For further details on how to handle exceptions in this
+                case, see :manual:`Transactions </core/transactions/>` in the Server
+                manual and select :guilabel:`C#` from the language dropdown to view 
+                the example.
 
                 |
                 | **Parameters**: ``Func <IClientSessionHandle, CancellationToken, Task<TResult>>``, ``TransactionOptions``, ``CancellationToken``
@@ -162,15 +161,13 @@ tabs to learn about the methods to manage your transaction:
                   learn more about this method, see the :manual:`withTransaction() page
                   </reference/method/Session.withTransaction/>` in the Server manual.
 
-                .. important:: Handling Exceptions
-
-                   When catching exceptions within the callback function used by
-                   ``WithTransactionAsync()``, you  **must** rethrow the exception
-                   before exiting the try-catch block. Failing to do so can result in an
-                   infinite loop. For further details on how to handle exceptions in this
-                   case, see :manual:`Transactions </core/transactions/>` in the Server
-                   manual and select :guilabel:`C#` from the language dropdown to view 
-                   the example.
+                :gold:`IMPORTANT:` When catching exceptions within the callback function used by
+                ``WithTransactionAsync()``, you  **must** rethrow the exception
+                before exiting the try-catch block. Failing to do so can result in an
+                infinite loop. For further details on how to handle exceptions in this
+                case, see :manual:`Transactions </core/transactions/>` in the Server
+                manual and select :guilabel:`C#` from the language dropdown to view 
+                the example.
 
                 |
                 | **Parameters**: ``Func <IClientSessionHandle, CancellationToken, Task<TResult>>``, ``TransactionOptions``, ``CancellationToken``