Figure.basemap: Improve the docstring for coltypes

[seisman]

Usually, the -f option sets the data types of input/output columns. But in basemap, it only sets the coordinate types specified in the -R option (xref: https://docs.generic-mapping-tools.org/dev/basemap.html). So the common description for coltypes makes no sense in Figure.basemap.

This PR fixes the docstring for coltypes in Figure.basemap to clarify it.

Preview: https://pygmt-dev--4856.org.readthedocs.build/en/4856/api/generated/pygmt.Figure.basemap.html#pygmt.Figure.basemap

[Copilot]

Pull request overview

This pull request updates pygmt.Figure.basemap documentation to clarify that coltypes (the GMT -f option) applies specifically to the coordinate types used by region (-R) in basemap, rather than the more general “input/output column types” meaning used by many other modules.

Changes:

• Replaced the generic $coltypes docstring template in basemap with a basemap-specific coltypes description and a link to the GMT basemap -f documentation.
• Minor reflow/wording edits in the basemap docstring introduction.
• (Unintended) Reordered the verbose parameter position in the function signature, which can be backward-incompatible for positional callers.

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