[memory.general] Add missing < character to C header name.

Author: zygoloid

source/utilities.tex

@@ -2944,7 +2944,7 @@
 This subclause describes the contents of the header
 \tcode{<memory>}~(\ref{memory.syn}) and some
 of the contents of the C headers \tcode{<cstdlib>} and
-\tcode{cstring>}~(\ref{c.malloc}).
+\tcode{<cstring>}~(\ref{c.malloc}).
 
 \rSec2[memory.syn]{Header \tcode{<memory>} synopsis}