doc: fix typo in description of close event

PR-URL: #37662
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

doc/api/http.md

@@ -1360,7 +1360,7 @@ passed as the second parameter to the [`'request'`][] event.
 added: v0.6.7
 -->
 
-Indicates that the the response is completed, or its underlying connection was
+Indicates that the response is completed, or its underlying connection was
 terminated prematurely (before the response completion).
 
 ### Event: `'finish'`