tlsv1.3.d. only for TLS-using connections

... and rephrase that "not all" TLS backends support it.

Closes #5764

diff --git a/docs/cmdline-opts/tlsv1.3.d b/docs/cmdline-opts/tlsv1.3.d
index 7061a61b2229bf8753e13fde0a6fd0e60147f16b..19da857b78a683922199d65450e0a6355a50f10d 100644 (file)
--- a/docs/cmdline-opts/tlsv1.3.d
+++ b/docs/cmdline-opts/tlsv1.3.d
@@ -3,8 +3,10 @@ Help: Use TLSv1.3 or greater
 Protocols: TLS
 Added: 7.52.0
 ---
-Forces curl to use TLS version 1.3 or later when connecting to a remote TLS server.
+Forces curl to use TLS version 1.3 or later when connecting to a remote TLS
+server.
 
-Note that TLS 1.3 is only supported by a subset of TLS backends. At the time
-of this writing, they are BoringSSL, NSS, and Secure Transport (on iOS 11 or
-later, and macOS 10.13 or later).
+If the connection is done without TLS, this option has no effect. This
+includes QUIC-using (HTTP/3) transfers.
+
+Note that TLS 1.3 is not supported by all TLS backends.