DOC: Fix typo in deprecation note for "map_scale" of Figure.coast (#4366)

Fix copy-past typo

Author: yvonnefroehlich

pygmt/src/coast.py

@@ -141,7 +141,7 @@ def coast(  # noqa: PLR0913
             This parameter is deprecated. Use :meth:`pygmt.Figure.scalebar` instead,
             which provides a more comprehensive and flexible API for adding scale bars
             to plots. This parameter still accepts raw GMT CLI strings for the ``-L``
-            option of the ``basemap`` module for backward compatibility.
+            option of the ``coast`` module for backward compatibility.
     box
         Draw a background box behind the map scale or rose. If set to ``True``, a simple
         rectangular box is drawn using :gmt-term:`MAP_FRAME_PEN`. To customize the box