Support for early data has been added to wolfSSL and quictls/OpenSSL.
Closes #17909
Enable the use of TLSv1.3 early data, also known as '0RTT' where possible.
This has security implications for the requests sent that way.
-This option is used when curl is built to use GnuTLS.
+This option can be used when curl is built to use GnuTLS, wolfSSL, quictls and
+OpenSSL as a TLS provider (but not BoringSSL, AWS-LC, or rustls).
If a server supports this TLSv1.3 feature, and to what extent, is announced
as part of the TLS "session" sent back to curl. Until curl has seen such