Copy interval docs from grdcontour.py to the levels docs in contour.py - #1043

Copy interval docs from grdcontour.py to the levels docs in contour.py#1043

seisman merged 5 commits into

masterGenericMappingTools/pygmt:masterfrom

levels-contour-updateGenericMappingTools/pygmt:levels-contour-updateCopy head branch name to clipboard