[over.ics.ref] Fix formatting of 'cv T' (cplusplus#7389)

Author: lprv

source/overloading.tex

@@ -2318,7 +2318,7 @@
 \rSec4[over.ics.ref]{Reference binding}
 
 \pnum
-When a parameter of type ``reference to \cv \tcode{T}''
+When a parameter of type ``reference to \cv~\tcode{T}''
 binds directly\iref{dcl.init.ref} to an argument expression:
 \begin{itemize}
 \item