extend the doc of cp2k external_input_path in detail

[robinzyb]

How to add code blocks in the doc?

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (e68580c) 47.22% compared to head (e024f03) 47.22%.

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #1225   +/-   ##
=======================================
  Coverage   47.22%   47.22%           
=======================================
  Files          82       82           
  Lines       14666    14666           
=======================================
  Hits         6926     6926           
  Misses       7740     7740           

Impacted Files	Coverage Δ
dpgen/generator/arginfo.py	100.00% <100.00%> (ø)

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[njzjz]

How to add code blocks in the doc?

It's generated in the RST file so that you can follow the RST grammar. https://devguide.python.org/documentation/markup/

[robinzyb]

why did CI fail at TypeError: issubclass() arg 1 must be a class ? I make no change on this part of test code

[njzjz]

why did CI fail at TypeError: issubclass() arg 1 must be a class ? I make no change on this part of test code

I can reproduce the error in a clean python 3.8 image.

[njzjz]

I submit materialsproject/api#809 to pymatgen and hope this issue can be resolved as soon as possible.