Fix legacy-websocket-configuration cross-reference

Closes gh-12969

docs/modules/ROOT/pages/servlet/integrations/websocket.adoc

@@ -397,7 +397,7 @@ open class WebSocketSecurityConfig : WebSocketMessageBrokerConfigurer {
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-On the other hand, if you are using the <<legacy `AbstractSecurityWebSocketMessageBrokerConfigurer`,legacy-websocket-configuration>> and you want to allow other domains to access your site, you can disable Spring Security's protection.
+On the other hand, if you are using the <<legacy-websocket-configuration,legacy `AbstractSecurityWebSocketMessageBrokerConfigurer`>> and you want to allow other domains to access your site, you can disable Spring Security's protection.
 For example, in Java Configuration you can use the following:
 
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