The link of Server-Sent Events is broken

[acktsap]

The link of Server-Sent Events is broken.

spring-framework/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/SseEmitter.java

Line 38 in dd888ed

* <a href="https://www.w3.org/TR/eventsource/">Server-Sent Events</a>.

Actually it's not exactly broken. It goes to https://html.spec.whatwg.org/multipage/. But i think it should go to https://html.spec.whatwg.org/multipage/server-sent-events.html

[sdeleuze]

Please just open a PR next time.