updated the comment section of this script. Not part of the build system.

xpinstall/wizard/windows/builder/build.pl

@@ -21,6 +21,10 @@
 # Contributor(s): 
 #   Sean Su <ssu@netscape.com>
 
+#
+# Purpose:
+#    To build the mozilla self-extracting installer and its corresponding .xpi files
+#    given a mozilla build on a local system.
 #
 # Requirements:
 # 1. perl needs to be installed correctly on the build system because cwd.pm is used.