doc: fix typos in http.md

PR-URL: #40161
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>

doc/api/http.md

@@ -1360,7 +1360,7 @@ before closing keep alive connection.
 
 A value of `null` will disable the limit.
 
-When limit is reach it will set `Connection` header value to `closed`,
+When the limit is reached it will set the `Connection` header value to `close`,
 but will not actually close the connection, subsequent requests sent
 after the limit is reached will get `503 Service Unavailable` as a response.