[Bug web/92880] Documentation for Built-in Vector-Extensions should mention C99 Fixed-width ints as base types

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92880

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Because the fixed types in C99 are just typedef of normal types.  So it really
does not need to describe that.