[class.prop] Remove stray closing parenthesis (cplusplus#7879)

Author: Andreas-Krug

source/classes.tex

@@ -243,7 +243,7 @@
 
 \item overload resolution fails or selects a deleted assignment operator
 function when assigning to an lvalue of type \tcode{C} from an xvalue of type
-\tcode{C} \iref{expr.assign,over.assign}), or
+\tcode{C}\iref{expr.assign,over.assign}, or
 
 \item it has a deleted destructor.
 \end{itemize}