vasprintf: Update documentation

[Bruno Haible]

The 'vasprintf' module provides not only the vasprintf, but also the asprintf
function. But the doc does not mention it. This fixes it:


2010-04-05  Bruno Haible  <address@hidden>

        vasprintf: Update documentation.
        * doc/glibc-functions/asprintf.texi: Mention the 'vasprintf' module.

--- doc/glibc-functions/asprintf.texi.orig      Mon Apr  5 15:26:41 2010
+++ doc/glibc-functions/asprintf.texi   Mon Apr  5 15:25:41 2010
@@ -2,15 +2,15 @@
 @subsection @code{asprintf}
 @findex asprintf
 
-Gnulib module: ---
+Gnulib module: vasprintf
 
 Portability problems fixed by Gnulib:
 @itemize
address@hidden
+This function is missing on some platforms:
+AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw, Interix 3.5.
 @end itemize
 
 Portability problems not fixed by Gnulib:
 @itemize
address@hidden
-This function is missing on some platforms:
-AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw, Interix 3.5.
 @end itemize