polish the pdf intro

utils/makedoc/intro.tex

@@ -33,30 +33,27 @@ \chapter{Introduction}
 \subsubsection{Preface}
 
 Prima is an extensible Perl toolkit for multi-platform GUI development.
-Platforms supported include Linux, Windows NT/9x/2K, and UNIX/X11
-workstations (FreeBSD, IRIX, SunOS, Solaris and others).
-The toolkit contains a rich set of standard widgets and has emphasis on 2D
-image processing tasks. A Perl program using PRIMA looks and behaves identically
-on X11 and Win32.
+Platforms supported include Linux, Windows, and UNIX/X11 workstations
+(FreeBSD, IRIX, SunOS, Solaris, and others). The toolkit contains a rich set
+of standard widgets and has an emphasis on 2D image processing tasks. A Perl
+program using Prima looks and behaves identically on X11 and Win32.
 
 The Prima project was started in 1997 in Protein Laboratory, Copenhagen,
 by Anton Berezin, Dmitry Karasik, and Vadim Belman.
 
-This document describes programming with Prima graphic toolkit, and is a
-collection of manual pages of Prima application program interface ( API ),
-written by D.Karasik, except Prima::IniFile and Prima::ScrollBar, written
-by A.Berezin.
+This document describes the programming with Prima graphic toolkit and is a
+collection of manual pages of the Prima application program interface ( API ).
 
 \subsubsection{Requirements}
 
-Prima supports perl versions 5.12 and above. The recommended perl
-versions are 5.20 and above. In UNIX(tm) environments, Prima can use
-the following graphic libraries: libjpeg, libgif, libtiff, libpng, libXpm, libwebp.
+Prima supports perl versions 5.12 and above. The recommended perl versions are
+5.20 and above. In the Unix environments, Prima can use the following graphic
+libraries: libjpeg, libgif, libtiff, libpng, libXpm, libwebp, and libheif.
 
 \subsubsection{Installation}
 
 The toolkit can be downloaded from \texttt{http://www.prima.eu.org} in
-source and binary forms. Before installing, check the content of README file
+source and binary forms. Before installing, check the content of the README file
 in the distribution. The installation from the source is performed by
 executing commands
 \begin{verbatim}