DOC: added some in-code documentation to vis.plot_ppi and vis.plot_rhi
DOC: added some in-code documentation to vis.plot_ppi and vis.plot_rhi

heistermann/wradlib,kmuehlbauer/wradlib,wradlib/wradlib,heistermann/wradlib,kmuehlbauer/wradlib,wradlib/wradlib