Bug 15766 fixed.

git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352980 13f79535-47bb-0310-9956-ffa450edef68

src/documentation/xdocs/poifs/fileformat.xml

@@ -2,6 +2,7 @@
 <!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd"> 
 <document>
   <header>
+    <title>POIFS File System Internals</title>
     <authors>
       <person email="mjohnson@apache.org" name="Marc Johnson" id="MJ"/>
     </authors>

src/documentation/xdocs/poifs/how-to.xml

@@ -2,6 +2,7 @@
 <!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd"> 
 <document>
   <header>
+    <title>How To Use the POIFS APIs</title>
     <authors>
       <person email="mjohnson@apache.org" name="Marc Johnson" id="MJ"/>
     </authors>

src/documentation/xdocs/poifs/usecases.xml

@@ -2,6 +2,7 @@
 <!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.1//EN" "../dtd/document-v11.dtd"> 
 <document>
   <header>
+    <title>POIFS Use Cases</title>
     <authors>
       <person email="mjohnson@apache.org" name="Marc Johnson" id="MJ"/>
     </authors>