[inplace.vector.overview] Remove spurious semicolon closing namespace std (#7566)

Author: AlisdairM

source/containers.tex

@@ -9713,7 +9713,7 @@
                           is_nothrow_move_constructible_v<T>))
       { x.swap(y); }
   };
-};
+}
 \end{codeblock}
 
 \rSec3[inplace.vector.cons]{Constructors}