Improve the help text for tied nodes in the job configuration page to document

that jobs can be tied to labels. FIXED HUDSON-2139


git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@21066 71c3de6d-444a-0410-be80-ed276b4c234a

war/resources/help/project-config/slave.html

@@ -3,6 +3,11 @@
   (or master).  If so, this option forces Hudson to always build this project
   on a specific computer.
 
+  If there is a group of machines that the job can be built on, you can specify
+  that label as the node to tie on, which will cause Hudson to build the
+  project on any of the machines with that label.
+
+  <p>
   Otherwise, uncheck the box so that Hudson can schedule builds on available
   nodes, which results in faster turn-around time.