Fix "Configuring the WebSocket Engine" documentation [SPR-11565]

[spring-projects-issues]

Sébastien Deleuze opened SPR-11565 and commented

Current Spring websocket reference documentation suggests to use WebSocketContainerFactoryBean to configure server side websocket engine, but this one is for client-side use only.

This section should be updated in order to specify that ServletServerContainerFactoryBean is for server side use and WebSocketContainerFactoryBean for client side use.

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Affects: 4.0.2

Reference URL: http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/#websocket-server-runtime-configuration

[spring-projects-issues]

Sébastien Deleuze commented

Pull request #489 submitted.