Sync upstream Go 1.27+; Add "[REALITY] SECTION" comments (#30)

https://github.com/XTLS/REALITY/pull/30#issuecomment-5579024460
https://github.com/XTLS/REALITY/pull/30#issuecomment-5594872257
https://github.com/XTLS/REALITY/pull/38#issuecomment-5752892932

ticket.go

@@ -81,7 +81,7 @@ type SessionState struct {
 	version     uint16
 	isClient    bool
 	cipherSuite uint16
-	// createdAt is the generation time of the secret on the sever (which for
+	// createdAt is the generation time of the secret on the server (which for
 	// TLS 1.0–1.2 might be earlier than the current session) and the time at
 	// which the ticket was received on the client.
 	createdAt        uint64 // seconds since UNIX epoch