Noting a difference between <property file="..."/> and <loadproperties srcfile="..."/>.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@278149 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/loadproperties.html

@@ -13,6 +13,8 @@
 Load a file's contents as Ant properties.  This is equivalent
 to <code>&lt;property file|resource=&quot;...&quot;/&gt;</code> except that it
 supports nested <code>&lt;filterchain&gt;</code> elements.
+Also if the file is missing, the build is halted with an error, rather
+than a warning being printed.
 </p>
 
 <p>If you want to simulate <a href="property.html">property</a>'s