fixup: latex markup

Author: jensmaurer

source/expressions.tex

@@ -7452,7 +7452,7 @@
 
 \item
 a conversion
-from a prvalue \tcode{P} of type ``pointer to \cv{}~\tcode{\keyword{void}}''
+from a prvalue \tcode{P} of type ``pointer to \cv{}~\keyword{void}''
 to a pointer-to-object type \tcode{T}
 unless \tcode{P} points to an object whose type is similar to \tcode{T};