[support] Fix table labels.

Author: jensmaurer

source/support.tex

@@ -20,9 +20,9 @@
 support for contract violation handling,
 support for exception processing, support for initializer lists,
 and other runtime support,
-as summarized in \tref{lang.sup.lib.summary}.
+as summarized in \tref{language.support.summary}.
 
-\begin{libsumtab}{Language support library summary}{lang.sup.lib.summary}
+\begin{libsumtab}{Language support library summary}{support.summary}
 \ref{support.types}       & Common definitions        &
   \tcode{<cstddef>}, \tcode{<cstdlib>}   \\ \rowsep
 \ref{support.limits}      & Implementation properties &