Revise documentation on using WebClient::exchange

This commit revised the paragraph regarding the need to consume or
release the ClientResponse body when using WebClient::exchange.

Closes gh-23498

Author: poutsma

src/docs/asciidoc/web/webflux-webclient.adoc

@@ -462,12 +462,20 @@ At this level, you can also create a full `ResponseEntity`:
 Note that (unlike `retrieve()`), with `exchange()`, there are no automatic error signals for
 4xx and 5xx responses. You have to check the status code and decide how to proceed.
 
-CAUTION: When you use `exchange()`, you must always use any of the `body` or `toEntity` methods of
-`ClientResponse` to ensure resources are released and to avoid potential issues with HTTP
-connection pooling. You can use `bodyToMono(Void.class)` if no response content is
-expected. However, if the response does have content, the connection
-is closed and is not placed back in the pool.
-
+[CAUTION]
+====
+When using `exchange()`, you have to make sure that the body is always consumed or released,
+even when an exception occurs (see <<core.adoc#databuffers-using,Using DataBuffer>>).
+Typically, you do this by invoking either `bodyTo*` or `toEntity*` on `ClientResponse`
+to convert the body into an object of the desired type, but
+you can also invoke `releaseBody()` to discard the body contents without consuming it or
+`toBodilessEntity()` to get just the status and headers (while discarding the body).
+
+Finally, there is `bodyToMono(Void.class)`, which should only be used if no response content is
+expected.
+If the response does have content, the connection is closed and is not placed back in the pool,
+because it is not left in a reusable state.
+====