pbx/README.adoc: Link to PR #3675 (Asterisk 21 & FreePBX 17)

roles/pbx/README.adoc

@@ -4,7 +4,7 @@
 
 https://internet-in-a-box.org[Internet-in-a-Box (IIAB)] can install https://asterisk.org/[Asterisk] and https://freepbx.org/[FreePBX] for Voice over IP (VoIP) calls using regular Android and iPhone softphone (SIP) apps — e.g. for low-cost and rural telephony.
 
-As of February 2024, IIAB supports https://www.asterisk.org/asterisk-news/asterisk-21-0-0-now-available/[Asterisk 21] and https://www.freepbx.org/freepbx-17-beta-release-and-debian-future/[FreePBX 17 Beta].  A https://github.com/iiab/iiab/wiki/IIAB-Platforms#operating-systems[modern OS with PHP 8.x] is required.
+As of February 2024, IIAB supports https://www.asterisk.org/asterisk-news/asterisk-21-0-0-now-available/[Asterisk 21] and https://www.freepbx.org/freepbx-17-beta-release-and-debian-future/[FreePBX 17 Beta].  A https://github.com/iiab/iiab/wiki/IIAB-Platforms#operating-systems[modern OS with PHP 8.x] is required (https://github.com/iiab/iiab/pull/3675[PR #3675]).
 
 ////
 *PHP 7.4 is unfortunately REQUIRED (https://github.com/iiab/iiab/pull/2899[PR #2899]) and PHP 8.x does not yet work (https://github.com/iiab/iiab/issues/3556[#3556], https://github.com/iiab/iiab/pull/3675[#3675]) — sadly this remains true as of 2024-01-13 with https://www.freepbx.org/freepbx-17-beta-release-and-debian-future/[FreePBX 17 BETA], and may remain true until https://github.com/FreePBX/framework/tree/release/17.0[FreePBX 17] is eventually released — so if you really must try to force an install onto dangerously EOL'd (end-of-life as of November 2022) PHP 7.4, consider an older OS like https://github.com/iiab/iiab/wiki/IIAB-Platforms#operating-systems[Ubuntu 20.04, Debian 11 "Bullseye", or 64-bit Raspberry Pi OS versions based on "Bullseye"] (https://github.com/iiab/iiab/pull/3523[PR #3523]).  RECAP: IIAB does _NOT_ support such dangerous/older OS's!*