[libstdc++, doc] improve two references in the ABI part of the manual

[Gerald Pfeifer]

I noticed that we had two occurrences of the original URL, and while
at it I took care of one of those "here" (actually "this part") links.

Applied to mainline; I'm thinking to also backport for GCC 4.5 later.

Gerald


2011-01-30  Gerald Pfeifer  <gerald@pfeifer.com>
 
	* doc/xml/manual/abi.xml: Adjust link to C++ ABI specification.
	Improve description of one such reference.

Index: doc/xml/manual/abi.xml
===================================================================
--- doc/xml/manual/abi.xml	(revision 169407)
+++ doc/xml/manual/abi.xml	(working copy)
@@ -54,7 +54,7 @@
   virtual functions, etc. These details are defined as the compiler
   Application Binary Interface, or ABI. The GNU C++ compiler uses an
   industry-standard C++ ABI starting with version 3. Details can be
-  found in the <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.codesourcery.com/cxx-abi/abi.html"> ABI
+  found in the <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.codesourcery.com/public/cxx-abi/abi.html">ABI
   specification</link>.
 </para>
 
@@ -754,9 +754,11 @@
 class that would otherwise have implicit versions. This will change
 the way the compiler deals with this class in by-value return
 statements or parameters: instead of passing instances of this
-class in registers, the compiler will be forced to use memory. See <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.codesourcery.com/cxx-abi/abi.html#calls"> this part</link>
+class in registers, the compiler will be forced to use memory. See the
+section on <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.codesourcery.com/public/cxx-abi/abi.html#calls">Function
	+Calling Conventions and APIs</link>
  of the C++ ABI documentation for further details.
- </para></listitem>
+</para></listitem>
 
 </orderedlist>