Improve the docstring of the pygmt package (#1016)
Improve the docstring of the pygmt package (#1016)

Co-authored-by: Dongdong Tian <3eae6d0b95aef6af8a0d785fe9f127268703c43c@gmail.com>
Co-authored-by: Yao Jiayuan <4a3b81659a3e41c1b1e422525b254e800e0ba11d@gmail.com>
Co-authored-by: Meghan Jones <b6fecba088d0ca1791bd419c72e553d62e7cbe73@hawaii.edu>
GenericMappingTools/gmt-python,GenericMappingTools/gmt-python