DOC: minor errors/typos in tutorials

[avm19]

1. Note that behind the scenes the tutorial.open_dataset downloads a file

xarray-tutorial/overview/xarray-in-45-min.ipynb

Line 68 in 93d41e2

"Note that behind the scenes the `tutorial.open_dataset` downloads a file. It then uses [`xarray.open_dataset`](https://docs.xarray.dev/en/stable/generated/xarray.open_dataset.html#xarray-open-dataset) function to open that file (which for this datasets is a [netCDF](https://www.unidata.ucar.edu/software/netcdf/) file). \n",

should probably say "Note that behind the scenes the tutorial.load_dataset downloads a file.

2. ... Zarr array with a chunk size of (100, 100, 100) and a shard size of (1000, 1000, 1000). This means that each shard will contain 10 chunks ...

xarray-tutorial/intermediate/intro-to-zarr.ipynb

Line 412 in 93d41e2

"This example shows how to create a sharded Zarr array with a chunk size of `(100, 100, 100)` and a shard size of `(1000, 1000, 1000)`. This means that each shard will contain 10 chunks, and each chunk will be of size `(100, 100, 100)`.\n"

should probably say "each shard will contain 1000 chunks"