Restored proper tense in limit_conn description. The limit_conn module only limits connections with active requests, that is, if a connection has a request "being processed" by the server. During a text review in 95c3c3bbf1ce it was changed to "has a request processed", which is incorrect (it is true after processing the first request). Reported by Abilio Marques, http://mailman.nginx.org/pipermail/nginx/2017-December/055322.html.

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