updated documentation for IT custom toolchain directory

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1643690 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/site/apt/toolchains/custom.apt b/src/site/apt/toolchains/custom.apt
index d81f6ff..70046f9 100644
--- a/src/site/apt/toolchains/custom.apt
+++ b/src/site/apt/toolchains/custom.apt
@@ -30,7 +30,7 @@
   A full working sample is included in <<<maven-toolchains-plugin>>> ITs, which are part of 
   {{{../source-repository.html}the plugin source tree}}:
 
-  * see <<<src/it/custom-toolchain-plugin>>> for the custom toolchain and plugin,
+  * see <<<src/it/setup-custom-toolchain>>> for the custom toolchain and plugin,
 
   * see <<<src/it/use-custom-toolchain>>> for a sample project using the toolchain through its plugin.