minor documentation tweaks

afms/README

-External package containing font metrics
+External package containing font metrics.

wizards/README

 Java wizards for db setup, importing, tutorials, etc.
+
+There are also partially converted python copies of each wizard, which
+we are hoping to migrate to in order to remove the Java dependency here.
\ No newline at end of file

xmlhelp/README

-Help reader and viewer for online help.
+Help reader and viewer for online help.
\ No newline at end of file

xmlreader/README

+fast/small XML pull parser.
+
+Implements a simple, fast pull parser, currently used by [[configmgr]] and
+[[stoc]]'s simpleregistry code (used to register UNO components in
+services.rdb files). It supports a subset of XML features, but is fast
+and small.
+

xpdf/README

 PDF-viewer library from [http://www.foolabs.com/xpdf/].
+
+This code is -used by [[sdext/source/pdfimport]] to implement the PDF
+import functionality, that allows PDF's to be edited.