[RELEASE] Released version 2.3.10

Released version 2.3.10 with the following main changes :
    - BUILD: backend: fix build breakage in idle conn locking fix
    - BUG/MINOR: tcp: fix silent-drop workaround for IPv6
    - BUILD: tcp: use IPPROTO_IPV6 instead of SOL_IPV6 on FreeBSD/MacOS
    - BUG/MINOR: ssl: Fix update of default certificate
    - BUG/MINOR: ssl: Prevent removal of crt-list line if the instance is a default one
    - BUG/MINOR: http_fetch: make hdr_ip() resistant to empty fields
    - BUG/MINOR: ssl: Add missing free on SSL_CTX in ckch_inst_free
    - REGTESTS: ssl: "set ssl cert" and multi-certificates bundle
    - DOC: Explicitly state only IPv4 are supported by forwardfor/originalto options
    - REGTESTS: ssl: mark set_ssl_cert_bundle.vtc as broken
    - CONTRIB: halog: fix issue with array of type char
    - BUG/MINOR: tools: fix parsing "us" unit for timers
    - DOC: clarify that compression works for HTTP/2
    - MINOR: No longer rely on deprecated sample fetches for predefined ACLs
    - BUG/MEDIUM: sample: Fix adjusting size in field converter
    - DOC: ssl: Certificate hot update only works on fronted certificates
    - BUG/MEDIUM: threads: Ignore current thread to end its harmless period
    - BUG/MINOR: checks: Set missing id to the dummy checks frontend
    - MINOR: logs: Add support of checks as session origin to format lf strings
    - BUG/MINOR: connection: Fix fc_http_major and bc_http_major for TCP connections
    - MINOR: connection: Make bc_http_major compatible with tcp-checks
    - BUG/MINOR: ssl-samples: Fix ssl_bc_* samples when called from a health-check
    - BUG/MINOR: http-fetch: Make method smp safe if headers were already forwarded
    - BUG/MINOR: http_htx: Remove BUG_ON() from http_get_stline() function
    - BUG/MINOR: logs: Report the true number of retries if there was no connection
    - BUG/MINOR: mux-h1: Release idle server H1 connection if data are received
    - BUG/MINOR: server: free srv.lb_nodes in free_server
    - BUG/MAJOR: mux-h2: Properly detect too large frames when decoding headers
    - BUG/MEDIUM: mux-h2: Fix dfl calculation when merging CONTINUATION frames
    - BUG/MEDIUM: config: fix cpu-map notation with both process and threads
    - BUG/MINOR: mworker/init: don't reset nb_oldpids in non-mworker cases
    - BUG/MINOR: mworker: don't use oldpids[] anymore for reload
    - BUG/MEDIUM: mux-h2: Properly handle shutdowns when received with data
    - BUG/MINOR: peers: remove useless table check if initial resync is finished
    - BUG/MEDIUM: peers: re-work connection to new process during reload.
    - BUG/MEDIUM: peers: re-work refcnt on table to protect against flush
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 991ac8c..815c779 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -4,7 +4,7 @@
                          ----------------------
                               version 2.3
                              willy tarreau
-                              2021/03/30
+                              2021/04/23
 
 
 This document covers the configuration language as implemented in the version