[basic.def.odr] Fix hyphenation of "{copy,move} assignment"

Author: Eisenwave

source/basic.tex

@@ -489,7 +489,7 @@
 \pnum
 An assignment operator function in a class is odr-used by an
 implicitly-defined
-copy-assignment or move-assignment function for another class as specified
+copy assignment or move assignment function for another class as specified
 in~\ref{class.copy.assign}.
 A constructor for a class is odr-used as specified
 in~\ref{dcl.init}. A destructor for a class is odr-used if it is potentially