doc: Fix the description of grdcontour -G option
@@ -295,7 +295,11 @@ class BasePlotting:
{J}
{R}
{B}
- {G}
+ label_placement : str
+ ``[d|f|n|l|L|x|X]params``.
+ The required argument controls the placement of labels along the
+ quoted lines. It supports five controlling algorithms. See
+ :gmt-docs:`grdcontour.html#g` for details.
{U}
{V}
{W}
