Consistently use ns for namespace in docs/examples

[MarcoGorelli]

namespace = dataframe.__dataframe_namespace__() is quite verbose, how about just using a 2-letter acronym in the examples? most people alias namespace to 2-letter acronyms anyway

[rgommers]

Thanks Marco. This makes sense to me. I was never quite a fan of the namespace name. ns seems better - or something like pdx would work too (we use xp on the array side).

[MarcoGorelli]

thanks - yeah thought of pdx too but it struck me as too pandas-centric

[rgommers]

Makes sense. Let's see if anyone else has a strong opinion - if not, then let's merge within a couple of days.

[kkraus14]

For what it's worth, I interpret pdx as Python DataFrame X and unrelated to pandas, so I'd be +1 to that. ns makes me think nanoseconds 😆

[MarcoGorelli]

thanks all

looks like people are happy with pdx