added help screen for axes.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@3863 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/resources/hudson/matrix/MatrixProject/configure-entries.jelly

@@ -60,7 +60,8 @@
     </j:if>
 
     <j:set var="userAxes" value="${it.userAxes}" />
-    <f:optionalBlock name="hasAxes" title="Variables" checked="${!empty(userAxes)}">
+    <f:optionalBlock name="hasAxes" title="Axes" checked="${!empty(userAxes)}"
+        help="/help/matrix/axes.html">
       <f:entry>
         <f:repeatable var="axis" items="${userAxes}" noAddButton="true" minimum="1">
           <table>

war/resources/help/matrix/axes.html

+<div>
+  If your configuration matrix needs additional axes, you can specify them here.
+  <p>
+  For example, let's say you are trying to run a test for your database application,
+  and you need to test it with three databases, mysql and postgresql, and oracle. Your
+  build script is designed so that you can test with a particular database by doing
+  <tt>ant -Ddatabase=mysql</tt>.
+  <p>
+  This is the concept of axis. You can have a variable called "database",
+  which takes three values. When you configure it, Hudson will run 3 builds, each with
+  different values assigned to the "database" variable to exhaustively cover
+  the configuration matrix.
+</div>
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