DOC: fixed typo in np-indexing.png explaining [-2:] slice in user guide

In User Guide of NumPy in tutorial for absulute beginners, i.e. in
documentation document doc/source/user/absulute_beginners.rst there was
a typo in the image np-indexing.png visualizing slices in **Indexing
and slicing** section. Namely, in the first image in mentioned section,
the last visualized array (under `data[-2:]` command), there was a
picture of `data[:]` or `data[0:3]` (i.e. array([1,2,3])) presenting
the slice indexing. But it should be a picture of of `data[-2:]` (i.e.
array([2,3])). This commit fixes this by adding additional picture of
array([2,3]) under `data[-2:]` command and changing command above last
array([1,2,3]) pic to title named `data` to preserve the idea behind
slice indexing.

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