Clarify documentation regarding attributes used in get_angles

[ghiggi]

Add to the doc the missing attributes required by get_angles().

[djhoese]

Thanks for fixing this. Before merging I'd like to look at the generated website (the build_website CI job will make a tarball I can't download). I'm just writing this here to remind myself.

[codecov]

Codecov Report

Merging #2020 (ef57885) into main (367d51d) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2020   +/-   ##
=======================================
  Coverage   93.56%   93.56%           
=======================================
  Files         282      282           
  Lines       41637    41637           
=======================================
+ Hits        38957    38958    +1     
+ Misses       2680     2679    -1     

Flag	Coverage Δ
behaviourtests	4.78% <ø> (ø)
unittests	94.09% <ø> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
satpy/modifiers/angles.py	96.68% <ø> (ø)
satpy/readers/ahi_hsd.py	97.64% <0.00%> (+0.39%)	⬆️

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[coveralls]

Coverage increased (+0.002%) to 94.024% when pulling ef57885 on ghiggi:patch-1 into 367d51d on pytroll:main.

[djhoese]

Thanks!