Polish "Document @RequestAttribute"

See gh-32231

framework-docs/modules/ROOT/pages/integration/rest-clients.adoc

@@ -973,6 +973,9 @@ method parameters:
   `Map<String, ?>` with multiple variables, or an individual value. Type conversion
   is supported for non-String values.
 
+| `@RequestAttribute`
+| Provide an `Object` to add as a request attribute. Only supported by `WebClient`.
+
 | `@RequestBody`
 | Provide the body of the request either as an Object to be serialized, or a
   Reactive Streams `Publisher` such as `Mono`, `Flux`, or any other async type supported
@@ -1001,11 +1004,6 @@ method parameters:
   `MultiValueMap<String, ?>` with multiple cookies, a `Collection<?>` of values, or an
   individual value. Type conversion is supported for non-String values.
 
-| `@RequestAttribute`
-| Provide an `Object` to add as a request attribute. Available only when a client
-  that supports request attributes is used under the hood. At this point
-  only supported for `WebClient`.
-
 |===