Fix misspellings (#2908)

modules/caddyhttp/reverseproxy/reverseproxy.go

@@ -234,7 +234,7 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyht
 	// etc.) - this obviously has a perf
 	// overhead and makes the proxy at
 	// risk of exhausting memory and more
-	// suseptible to slowloris attacks,
+	// susceptible to slowloris attacks,
 	// so it is strongly recommended to
 	// only use this feature if absolutely
 	// required, if read timeouts are set,

modules/caddyhttp/server.go

@@ -399,7 +399,7 @@ func errLogValues(err error) (status int, msg string, fields []zapcore.Field) {
 // (into the urlCopy parameter, which should be on the
 // stack), req.RequestURI, and req.RemoteAddr. Notably,
 // headers are not copied. This function is designed to
-// be very fast and efficient, and useful primarly for
+// be very fast and efficient, and useful primarily for
 // read-only/logging purposes.
 func originalRequest(req *http.Request, urlCopy *url.URL) http.Request {
 	cloneURL(req.URL, urlCopy)