Refine documentation of NAN problem.

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+2008-04-01  Bruno Haible  <bruno@clisp.org>
+
+       * doc/posix-headers/math.texi: Refine documentation of NAN problem.
+
 2008-04-01  Bruno Haible  <bruno@clisp.org>
 
        * tests/test-vasnprintf-posix.c: Include nan.h instead of <math.h>.