Format BereqEnd in the same way as the other tags

include/tbl/vsl_tags.h

@@ -171,12 +171,16 @@ SLTM(Length, "Size of object body",
 
 SLTM(BereqEnd, "Backend request end",
 	"Marks the end of a backend request.\n\n"
-	"Tstart\n    Timestamp when the fetch started (epoch)\n\n"
-	"Tend\n    Timestamp when the fetch ended (epoch)\n\n"
-	"dTsend\n    Time to send the backend request\n\n"
-	"dThdr\n    Time to receive the backend response headers\n\n"
-	"dTbody\n    Time to receive the backend response body\n\n"
-	"dTresp\n    Time to receive the backend response (dThdr + dTbody)\n\n"
+	"The format is::\n\n"
+	"\t%f %f %f %f %f %f\n"
+	"\t|  |  |  |  |  |\n"
+	"\t|  |  |  |  |  +- Time to receive response (hdr + body)\n"
+	"\t|  |  |  |  +---- Time to receive body\n"
+	"\t|  |  |  +------- Time to receive headers\n"
+	"\t|  |  +---------- Time to send request body\n"
+	"\t|  +------------- Timestamp (since epoch) when the request ended\n"
+	"\t+---------------- Timestamp (since epoch) when the request started\n"
+	"\n"
 )
 
 SLTM(FetchError, "Error while fetching object",