* manual/string.texi: Fix typo in wmemcpy decl.
@comment wchar.h
@comment ISO
-@deftypefun {wchar_t *} wmemcpy (wchar_t *restrict @var{wto}, const wchar_t *restruct @var{wfrom}, size_t @var{size})
+@deftypefun {wchar_t *} wmemcpy (wchar_t *restrict @var{wto}, const wchar_t *restrict @var{wfrom}, size_t @var{size})
The @code{wmemcpy} function copies @var{size} wide characters from the object
beginning at @var{wfrom} into the object beginning at @var{wto}. The
behavior of this function is undefined if the two arrays @var{wto} and