http2: add error counter to one missing processHeaders error path

And unrelated typo fix.

Updates golang/go#48675

Change-Id: Id90e0e76e514ba550fa2d3c9e1104ebfd4c23a9b
Reviewed-on: https://go-review.googlesource.com/c/net/+/353031
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
Trust: Josh Bleecher Snyder <josharian@gmail.com>

http2/server.go

diff --git a/http2/server.go b/http2/server.go
index 1caab32..c67e9b7 100644
--- a/http2/server.go
+++ b/http2/server.go
@@ -2009,7 +2009,7 @@
 	isConnect := rp.method == "CONNECT"
 	if isConnect {
 		if rp.path != "" || rp.scheme != "" || rp.authority == "" {
-			return nil, nil, streamError(f.StreamID, ErrCodeProtocol)
+			return nil, nil, sc.countError("bad_connect", streamError(f.StreamID, ErrCodeProtocol))
 		}
 	} else if rp.method == "" || rp.path == "" || (rp.scheme != "https" && rp.scheme != "http") {
 		// See 8.1.2.6 Malformed Requests and Responses:

http2/transport.go

diff --git a/http2/transport.go b/http2/transport.go
index 94e0bef..a45e2e1 100644
--- a/http2/transport.go
+++ b/http2/transport.go
@@ -2612,7 +2612,7 @@
 	cc := rl.cc
 	cs := cc.streamByID(f.StreamID, true)
 	if cs == nil {
-		// TODO: return error if server tries to RST_STEAM an idle stream
+		// TODO: return error if server tries to RST_STREAM an idle stream
 		return nil
 	}
 	if cc.isDoNotReuseAndIdle() {