fix double cell in advanced_indexing

[HoWol76]

In the lesson on advanced indexing, there are two cells with the exact same contents:

target_lat = xr.DataArray([31, 41, 42, 42], dims="degrees_north")
target_lon = xr.DataArray([200, 201, 202, 205], dims="degrees_east")

da.sel(lat=target_lat, lon=target_lon, method="nearest")  # -- orthogonal indexing

(Cells [4] and [5])

I suspect that this was accidental, and I deleted one of them in this pull request.

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[dcherian]

Wonderful, thank you!