[over.assign] Rename stable label

This removes an easily avoidable vulgarity, and the original label
remains as a greppable prefix of the new one.

Author: AlisdairM

source/classes.tex

@@ -150,7 +150,7 @@
 
 \pnum
 \begin{note}
-Class objects can be assigned\iref{over.ass,class.copy.assign},
+Class objects can be assigned\iref{over.assign,class.copy.assign},
 passed as arguments to functions\iref{dcl.init,class.copy.ctor}, and
 returned by functions (except objects of classes for which copying or moving has
 been restricted; see~\ref{dcl.fct.def.delete} and \ref{class.access}).
@@ -1804,7 +1804,7 @@
 Because a copy/move assignment operator is implicitly declared for a class
 if not declared by the user,
 a base class copy/move assignment operator is always hidden
-by the corresponding assignment operator of a derived class\iref{over.ass}.
+by the corresponding assignment operator of a derived class\iref{over.assign}.
 \begin{note}
 A \grammarterm{using-declaration} in a derived class \tcode{C}
 that names an assignment operator from a base class
@@ -5223,7 +5223,7 @@
 \end{example}
 \begin{note}
 \indextext{initialization!overloaded assignment and}%
-Overloading of the assignment operator\iref{over.ass}
+Overloading of the assignment operator\iref{over.assign}
 has no effect on initialization.
 \end{note}
 

source/expressions.tex

@@ -7413,7 +7413,7 @@
 \item
 an assignment to an object of class type, in which case $B$
 is passed as the argument to the assignment operator function selected by
-overload resolution\iref{over.ass,over.match}.
+overload resolution\iref{over.assign,over.match}.
 \end{itemize}
 
 \begin{example}

source/overloading.tex

@@ -676,7 +676,7 @@
 \hdstyle{Subclause} &   \hdstyle{Expression} &   \hdstyle{As member function} &   \hdstyle{As non-member function} \\ \capsep
 \ref{over.unary}    &   \tcode{@a}   &   \tcode{(a).\keyword{operator}@ (\,)}  &   \tcode{\keyword{operator}@(a)}    \\
 \ref{over.binary}   &   \tcode{a@b}  &   \tcode{(a).\keyword{operator}@ (b)}   &   \tcode{\keyword{operator}@(a, b)} \\
-\ref{over.ass}      &   \tcode{a=b}  &   \tcode{(a).\keyword{operator}= (b)}   &                           \\
+\ref{over.assign}   &   \tcode{a=b}  &   \tcode{(a).\keyword{operator}= (b)}   &                           \\
 \ref{over.sub}      &   \tcode{a[b]} &   \tcode{(a).\keyword{operator}[](b)}   &                           \\
 \ref{over.ref}      &   \tcode{a->}  &   \tcode{(a).\keyword{operator}->(\,)}  &                           \\
 \ref{over.inc}      &   \tcode{a@}   &   \tcode{(a).\keyword{operator}@ (0)}   &   \tcode{\keyword{operator}@(a, 0)} \\
@@ -3402,7 +3402,7 @@
 described in the rest of \ref{over.oper}.
 
 \pnum
-Operators not mentioned explicitly in subclauses~\ref{over.ass} through~\ref{over.inc}
+Operators not mentioned explicitly in subclauses~\ref{over.assign} through~\ref{over.inc}
 act as ordinary unary and binary
 operators obeying the rules of~\ref{over.unary} or~\ref{over.binary}.%
 \indextext{overloading!resolution!best viable function|)}%
@@ -3483,7 +3483,7 @@
 a relational operator function, or
 a three-way comparison operator function.
 
-\rSec3[over.ass]{Simple assignment}
+\rSec3[over.assign]{Simple assignment}
 \indextext{assignment operator!overloaded}%
 \indextext{overloading!assignment operator}
 

source/xrefdelta.tex

@@ -103,6 +103,7 @@
 
 % https://github.com/cplusplus/draft/pull/7524
 \movedxref{expr.ass}{expr.assign}
+\movedxref{over.ass}{over.assign}
 
 %%% Deprecated features.
 %%% Example: