Fixup url in Dimension.dim_type docs (#1370)

Author: soxofaan

pystac/extensions/datacube.py

@@ -78,7 +78,7 @@ def __init__(self, properties: dict[str, Any]) -> None:
     def dim_type(self) -> DimensionType | str:
         """The type of the dimension. Must be ``"spatial"`` for
         :stac-ext:`Horizontal Spatial Dimension Objects
-        <datacube#horizontal-raster-spatial-dimension-object>` or
+        <datacube#horizontal-spatial-raster-dimension-object>` or
         :stac-ext:`Vertical Spatial Dimension Objects
         <datacube#vertical-spatial-dimension-object>`, ``geometries`` for
         :stac-ext:`Spatial Vector Dimension Objects