Updated docs on tool-writing. Moved them into the user manual.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@6339 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/docs/xml/manual-intro.xml b/docs/xml/manual-intro.xml
index a2058c9..8431741 100644
--- a/docs/xml/manual-intro.xml
+++ b/docs/xml/manual-intro.xml
@@ -156,9 +156,9 @@
it supports. Then, each tool has its own chapter in this manual. You
only need to read the documentation for the core and for the tool(s) you
actually use, although you may find it helpful to be at least a little
-bit familar with what all tools do. If you're new to all this, you
-probably want to run the Memcheck tool. If you want to write a new
-tool, read <xref linkend="writing-tools"/>.</para>
+bit familar with what all tools do. If you're new to all this, you probably
+want to run the Memcheck tool. The final chapter explains how to write a
+new tool.</para>
<para>Be aware that the core understands some command line flags, and
the tools have their own flags which they know about. This means there