Clarify SCT resumption comment

Change-Id: I35de23635dbc56fb355492fefa1c052a1fdb4fb8
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/69827
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>

ssl/test/runner/runner.go

diff --git a/ssl/test/runner/runner.go b/ssl/test/runner/runner.go
index 18ed78b..97eac02 100644
--- a/ssl/test/runner/runner.go
+++ b/ssl/test/runner/runner.go
@@ -8516,8 +8516,10 @@
 			differentSCTList = append(differentSCTList, testSCTList...)
 			differentSCTList[len(differentSCTList)-1] ^= 1
 
-			// The SCT extension did not specify that it must only be sent on resumption as it
-			// should have, so test that we tolerate but ignore it.
+			// The SCT extension did not specify that it must only be sent on the inital handshake as it
+			// should have, so test that we tolerate but ignore it. This is only an issue pre-1.3, since
+			// SCTs are sent in the CertificateEntry message in 1.3, whereas they were previously sent
+			// in an extension in the ServerHello pre-1.3.
 			testCases = append(testCases, testCase{
 				protocol: protocol,
 				name:     "SendSCTListOnResume-" + suffix,