Minor updates to the macOS installer screens for 3.8.0b2 (GH-14501)

diff --git a/Mac/BuildScript/resources/ReadMe.rtf b/Mac/BuildScript/resources/ReadMe.rtf
index ab7aeff..ec83750 100644
--- a/Mac/BuildScript/resources/ReadMe.rtf
+++ b/Mac/BuildScript/resources/ReadMe.rtf
@@ -1,4 +1,4 @@
-{\rtf1\ansi\ansicpg1252\cocoartf1671\cocoasubrtf200
+{\rtf1\ansi\ansicpg1252\cocoartf1671\cocoasubrtf500
 {\fonttbl\f0\fswiss\fcharset0 Helvetica;\f1\fswiss\fcharset0 Helvetica-Bold;\f2\fswiss\fcharset0 Helvetica-Oblique;
 \f3\fmodern\fcharset0 CourierNewPSMT;}
 {\colortbl;\red255\green255\blue255;}
@@ -8,12 +8,18 @@
 
 \f0\fs24 \cf0 This package will install Python $FULL_VERSION for macOS $MACOSX_DEPLOYMENT_TARGET for the following architecture(s): $ARCHITECTURES.\
 \
+\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\partightenfactor0
+
+\f1\b \cf0 NOTE: 
+\f0\b0 This is a beta test preview of Python 3.8.0, the next feature release of Python 3.8.  It is not intended for production use.\
+\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
+\cf0 \
 \pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
 
 \f1\b \cf0 \ul \ulc0 Certificate verification and OpenSSL\
 
 \f0\b0 \ulnone \
-This package includes its own private copy of OpenSSL 1.1.0.   The trust certificates in system and user keychains managed by the 
+This package includes its own private copy of OpenSSL 1.1.1.   The trust certificates in system and user keychains managed by the 
 \f2\i Keychain Access 
 \f0\i0 application and the 
 \f2\i security