Fix thread documentation integration with the combined docs.

[SVN r43698]

doc/Jamfile.v2

@@ -35,6 +35,7 @@ boostbook doc
     <dependency>../libs/intrusive/doc//autodoc.xml
     <dependency>../libs/intrusive/doc//intrusive
     <dependency>../libs/asio/doc//asio
+    <dependency>../libs/thread/doc//thread
 
     ## Add path references to the QuickBook generated docs...
 
@@ -49,6 +50,7 @@ boostbook doc
     <implicit-dependency>../libs/mpi/doc//mpi
     <implicit-dependency>../libs/interprocess/doc//interprocess
     <implicit-dependency>../libs/intrusive/doc//intrusive
+    <implicit-dependency>../libs/thread/doc//thread
 
     <xsl:param>boost.libraries=../../libs/libraries.htm
 

doc/src/boost.xml

@@ -650,7 +650,7 @@
      </libraryinfo>
    </library>
    
-   <xi:include href="../../libs/thread/doc/thread.xml"/>
+   <xi:include href="thread.xml"/>
 
    <library name="Timer" dirname="timer" html-only="1" 
             url="../../libs/timer/index.html">