Update documentation list

doc/libraries.xml

@@ -563,7 +563,7 @@
     <key>assign</key>
     <library_path>libs/assign/</library_path>
     <boost-version>1.32.0</boost-version>
-    <update-version>develop</update-version>
+    <update-version>master</update-version>
     <name>Assign</name>
     <authors>Thorsten Ottosen</authors>
     <maintainers>Thorsten Ottosen &lt;nesotto -at- cs.auc.dk&gt;</maintainers>
@@ -2020,7 +2020,7 @@
     <key>dynamic_bitset</key>
     <library_path>libs/dynamic_bitset/</library_path>
     <boost-version>1.29.0</boost-version>
-    <update-version>develop</update-version>
+    <update-version>master</update-version>
     <name>Dynamic Bitset</name>
     <authors>Jeremy Siek</authors>
     <authors>Chuck Allison</authors>
@@ -6636,7 +6636,7 @@
     <key>ptr_container</key>
     <library_path>libs/ptr_container/</library_path>
     <boost-version>1.33.0</boost-version>
-    <update-version>develop</update-version>
+    <update-version>master</update-version>
     <name>Pointer Container</name>
     <authors>Thorsten Ottosen</authors>
     <maintainers>Thorsten Ottosen &lt;nesotto -at- cs.auc.dk&gt;</maintainers>
@@ -7038,7 +7038,7 @@
     <key>rational</key>
     <library_path>libs/rational/</library_path>
     <boost-version>1.11.0</boost-version>
-    <update-version>develop</update-version>
+    <update-version>master</update-version>
     <name>Rational</name>
     <authors>Paul Moore</authors>
     <maintainers>Jonathan Turkanis &lt;turkanis -at- coderage.com&gt;</maintainers>