[dcl.type.cv,expr.ass] Clarify the meaning of "modify" for an object.

Author: jensmaurer

source/declarations.tex

@@ -1160,7 +1160,9 @@
 \pnum
 \indextext{const object!undefined change to}%
 Except that any class member declared \tcode{mutable}\iref{dcl.stc}
-can be modified, any attempt to modify a const object during its
+can be modified, any attempt to modify~(\ref{expr.ass},
+\ref{expr.post.incr}, \ref{expr.pre.incr}) a
+const object\iref{basic.type.qualifier} during its
 lifetime\iref{basic.life} results in undefined behavior.
 \begin{example}
 \begin{codeblock}

source/expressions.tex

@@ -5616,8 +5616,8 @@
 \end{bnf}
 
 \pnum
-In simple assignment (\tcode{=}), the result of the right operand replaces
-the value of the object referred to by the left operand.
+In simple assignment (\tcode{=}), the object referred to by the left operand
+is modified by replacing its value with the result of the right operand.
 
 \pnum
 \indextext{assignment!conversion by}%