Issue #19551: Update installer Welcome file.

Mac/BuildScript/resources/Welcome.rtf

-{\rtf1\ansi\ansicpg1252\cocoartf1187\cocoasubrtf390
-\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
+{\rtf1\ansi\ansicpg1252\cocoartf1187\cocoasubrtf400
+\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;\f1\fmodern\fcharset0 CourierNewPSMT;}
 {\colortbl;\red255\green255\blue255;}
 \paperw11905\paperh16837\margl1440\margr1440\vieww9640\viewh10620\viewkind0
 \pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640
@@ -16,13 +16,17 @@
 \b IDLE
 \b0  and a set of pre-built extension modules that open up specific Macintosh technologies to Python programs.\
 \
-See the ReadMe file and the Python documentation for more information.\
-\
 
-\b NOTE: 
-\b0 This package will not update your shell profile by default.  Double-click 
-\b Update Shell Profile
-\b0  at any time to make $FULL_VERSION the default Python 3 version.  This version can co-exist with other installed versions of Python 3 and Python 2.\
+\b NEW for Python 3.4: 
+\b0 This package now updates your shell profile by default to make $FULL_VERSION the default Python 3 version.  This version can co-exist with other installed versions of Python 3 and Python 2.  This package also installs a version of 
+\f1 pip
+\f0 , the recommended tool for installing and managing Python packages.   Type\
+\
+	
+\f1 pip3.4 --help
+\f0 \
+\
+for an overview.  See the ReadMe file and the Python documentation for more information.\
 \
 
 \b IMPORTANT for users of IDLE and tkinter: