[wwwdocs] Update libstdc++ front page

[Jonathan Wakely]

The current C++ standard has 30 chapters.

Committed to CVS.
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Index: libstdc++/index.html
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RCS file: /cvs/gcc/wwwdocs/htdocs/libstdc++/index.html,v
retrieving revision 1.37
diff -u -r1.37 index.html
--- libstdc++/index.html	1 Jun 2009 11:01:48 -0000	1.37
+++ libstdc++/index.html	14 Apr 2012 17:01:54 -0000
@@ -17,7 +17,7 @@
 <h2>What... is your quest?</h2>
 
 <p>This is an ongoing project to implement the ISO 14882 Standard
-   C++ Library as described in chapters 17 through 27 and Annex D.
+   C++ Library as described in chapters 17 through 30 and Annex D.
    <strong>Participation is welcome!</strong>
 </p>