Add 'core' to documentation.

doc/Jamfile.v2

@@ -42,6 +42,7 @@ boostbook doc
     <dependency>../libs/accumulators/doc//accumulators
     <dependency>../libs/circular_buffer/doc//standalone/<format>docbook
     <dependency>../libs/conversion/doc//lexical_cast
+    <dependency>../libs/core/doc//core
     <dependency>../libs/chrono/doc//chrono
     <dependency>../libs/program_options/doc//autodoc.xml
     <dependency>../libs/algorithm/string/doc//autodoc.xml
@@ -93,6 +94,7 @@ boostbook doc
     <implicit-dependency>../libs/accumulators/doc//accumulators
     <implicit-dependency>../libs/chrono/doc//chrono
     <implicit-dependency>../libs/conversion/doc//lexical_cast
+    <implicit-dependency>../libs/core/doc//core
     <implicit-dependency>../libs/functional/hash/doc//hash
     #<implicit-dependency>../libs/type_traits/doc//type_traits
     <implicit-dependency>../libs/static_assert/doc//static_assert

doc/src/boost.xml

@@ -200,6 +200,8 @@
      </libraryinfo>
    </library>
 
+   <xi:include href="core.xml"/>
+
    <library name="CRC" dirname="crc" html-only="1">
      <libraryinfo>
        <author>