moved concepts.xml xi:include into the Concept_Check <library> block to keep it from showing up at the bottom of doc/html/libraries.html

[SVN r33567]

doc/src/boost.xml

@@ -119,7 +119,7 @@
      </libraryinfo>
    </library>
 
-   <library name="Concept Check" dirname="concept_check" html-only="1">
+   <library name="Concept Check" dirname="concept_check">
      <libraryinfo>
        <author>
          <firstname>Jeremy</firstname>
@@ -129,10 +129,10 @@
        <librarycategory name="category:generic"/>
        <librarycategory name="category:testing"/>
      </libraryinfo>
+     <title>Boost.Concept_Check</title>
+     <xi:include href="../../libs/concept_check/doc/reference/concepts.xml"/>
    </library>
 
-   <xi:include href="../../libs/concept_check/doc/reference/concepts.xml"/>
-
    <library name="Config" dirname="config" html-only="1">
      <libraryinfo>
        <author>