[ub:expr.static.cast.does.not.contain.original.member] Adjust linebreak in example (#9205)

Author: Andreas-Krug

source/ub.tex

@@ -977,7 +977,8 @@
 
 int main() {
   char D::*p1 = &D::c;
-  char B::*p2 = static_cast<char B::*>(p1); // undefined behavior, \tcode{B} does not contain the original member \tcode{c}
+  char B::*p2 = static_cast<char B::*>(p1); // undefined behavior, \tcode{B} does not contain the
+                                            // original member \tcode{c}
 }
 \end{codeblock}
 \end{example}