[v3] More documentation

[Benjamin Kosnik]

>2004-01-30  Jerry Quinn  <jlquinn@optonline.net>
>
>	* include/bits/gslice.h (gslice):  Document.
>	* include/bits/gslice_array.h (gslice_array):  Document.
>	* include/bits/indirect_array (indirect_array):  Document.
>	* include/bits/mask_array (mask_array):  Document.
>	* include/bits/slice_array.h (slice,slice_array):  Document.
>	* include/bits/stl_numeric.h (accumulate, inner_product, partial_sum,
>	adjacent_difference):  Document
>	* include/std/std_valarray.h (valarray):  Document.

Looks good!