internal/quic/qlog: fix typo

VantageClient -> VantageServer

Change-Id: Ie9738cffb06f03f961815853247e6f9cbe7fe466
GitHub-Last-Rev: 5d440ad
GitHub-Pull-Request: #202
Reviewed-on: https://go-review.googlesource.com/c/net/+/555795
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Damien Neil <dneil@google.com>

internal/quic/qlog/qlog.go

@@ -29,7 +29,7 @@ const (
 	// VantageClient traces follow a connection from the client's perspective.
 	VantageClient = Vantage("client")
 
-	// VantageClient traces follow a connection from the server's perspective.
+	// VantageServer traces follow a connection from the server's perspective.
 	VantageServer = Vantage("server")
 )