[patch] fix anachronism in libstdc+ docs

[Jonathan Wakely]

        * doc/xml/manual/extensions.xml: Fix anachronism.

committed to trunk
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commit ab11f53f4046adc88e1f43568836c572bcd3bc44
Author: Jonathan Wakely <jwakely.gcc@gmail.com>
Date:   Sat Apr 20 20:31:32 2013 +0100

    	* doc/xml/manual/extensions.xml: Fix anachronism.

diff --git a/libstdc++-v3/doc/xml/manual/extensions.xml b/libstdc++-v3/doc/xml/manual/extensions.xml
index 1f3da2f..7b35d05 100644
--- a/libstdc++-v3/doc/xml/manual/extensions.xml
+++ b/libstdc++-v3/doc/xml/manual/extensions.xml
@@ -87,10 +87,11 @@ extensions, be aware of two things:
       3.1, 3.2 and 3.3).
    </para>
 
-   <para>Please note that the upcoming C++ standard has first-class
+   <para>Please note that the concept checks only validate the requirements
+   of the old C++03 standard. C++11 was expected to have first-class
    support for template parameter constraints based on concepts in the core
-   language. This will obviate the need for the library-simulated concept
-   checking described above.
+   language. This would have obviated the need for the library-simulated concept
+   checking described above, but was not part of C++11.
    </para>
 
 </chapter>