README: Remove client only restriction for QUIC.

The QUIC protocol is also supported on server side.
Update the README file accordingly.

Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27258)

README.md

@@ -10,8 +10,7 @@ Welcome to the OpenSSL Project
 ![Daily checks](https://github.com/openssl/openssl/actions/workflows/run-checker-daily.yml/badge.svg)
 
 OpenSSL is a robust, commercial-grade, full-featured Open Source Toolkit
-for the TLS (formerly SSL), DTLS and QUIC (currently client side only)
-protocols.
+for the TLS (formerly SSL), DTLS and QUIC protocols.
 
 The protocol implementations are based on a full-strength general purpose
 cryptographic library, which can also be used stand-alone. Also included is a
@@ -42,7 +41,7 @@ The OpenSSL toolkit includes:
 - **libssl**
   an implementation of all TLS protocol versions up to TLSv1.3 ([RFC 8446]),
   DTLS protocol versions up to DTLSv1.2 ([RFC 6347]) and
-  the QUIC (currently client side only) version 1 protocol ([RFC 9000]).
+  the QUIC version 1 protocol ([RFC 9000]).
 
 - **libcrypto**
   a full-strength general purpose cryptographic library. It constitutes the