fixed a few typos

[e-marshall]

few things not included in this:

• sst dataset link in computation notebook
• in computation notebook it looks like the t90_fromt68() function is expected to return a np array to setup using apply_ufunc() in the next cell but it returns a xr.DataArray instead - not sure if intentional or not ?

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[scottyhq]

sst dataset link in computation notebook

It seems this might be an intermittent error, so let's leave for now (might need to change to https://psl.noaa.gov/thredds/dodsC/Datasets/noaa.ersst.v5/sst.mnmean.nc)...

in computation notebook it looks like the t90_fromt68()

Noted in #61. I think we should remove the gsw section here and discuss apply_ufunc under Intermediate...

Thanks @e-marshall seems there is a kernel naming issue (maybe from nb_conda_kernels...) but otherwise happy to merge this and address these other issues later

[dcherian]

Nice work Emma!