Fix comment to be technically correct.

belatedly part of CURA-11041

Co-authored-by: Casper Lamboo <[email protected]>

include/sliceDataStorage.h

@@ -212,7 +212,7 @@ class SupportLayer
     std::vector<SupportInfillPart> support_infill_parts; //!< a list of support infill parts
     Polygons support_bottom; //!< Piece of support below the support and above the model. This must not overlap with any of the support_infill_parts or support_roof.
     Polygons support_roof; //!< Piece of support above the support and below the model. This must not overlap with any of the support_infill_parts or support_bottom.
-    Polygons support_fractional_roof_top; //!< If the support distance is less than a multiple of the layer height,
+    Polygons support_fractional_roof_top; //!< If the support distance is not exactly a multiple of the layer height,
                                           //   the first part of support just underneath the model needs to be printed at a fracional layer height.
     Polygons support_mesh_drop_down; //!< Areas from support meshes which should be supported by more support
     Polygons support_mesh; //!< Areas from support meshes which should NOT be supported by more support