ENH: Modify the markups for parameters (`x` to x)#303

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takanori-pskq wants to merge 2 commits intonumpy:mainfrom

takanori-pskq:modify-parameter-markup

Commits on Nov 7, 2020

ENH: Modify the markups for parameters (`x` to *x*)
takanori-pskq
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Commits on Nov 8, 2020

ENH: Modify to use a new option ``numpydoc_role_param``
takanori-pskq
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