Make sure the docs use tuple field accesses

[cphyc]

Following #3101 and #3194, ambiguous field accesses have been deprecated. We however have still many examples in the doc which use the old ambiguous syntax.

We should (gradually) update the doc to make sure no field accesses are ambiguous.

[neutrinoceros]

Is there a trivial way to make these actual failures as a way to catch them systematically in CI so we can fix them iteratively ?

[cphyc]

What one can do is replace the depreciation warming with a hard error. A more efficient way would be to reimplements the mechanism I used for #3101 i.e. replace non tuple field accesses by the guessed tuple. That could possibly be excavated out of the above mentioned PR. 1 May 2021 12:44:04 Clément Robert ***@***.***>:

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[chummels]

I am trying to partially address this in #3284

[neutrinoceros]

How much progress do you think you've accomplished in that PR @chummels ?

[chummels]

I think I got rid of all the non-tuple field accesses in the cookbook with that PR. I'll continue to work on the docs, but I'm open to others helping.

[neutrinoceros]

@chummels @cphyc , I know you've both made large contributions to the docs regarding this lately. Do you think we can close this ?

[neutrinoceros]

In #3970 I turned warnings into errors and got... zero (!) new error in the docs build. I think it's safe to close this now.