Add description for smart hiding to Corner Seam Pref description

resources/definitions/fdmprinter.def.json

@@ -1426,7 +1426,7 @@
                 "z_seam_corner":
                 {
                     "label": "Seam Corner Preference",
-                    "description": "Control whether corners on the model outline influence the position of the seam. None means that corners have no influence on the seam position. Hide Seam makes the seam more likely to occur on an inside corner. Expose Seam makes the seam more likely to occur on an outside corner. Hide or Expose Seam makes the seam more likely to occur at an inside or outside corner.",
+                    "description": "Control whether corners on the model outline influence the position of the seam. None means that corners have no influence on the seam position. Hide Seam makes the seam more likely to occur on an inside corner. Expose Seam makes the seam more likely to occur on an outside corner. Hide or Expose Seam makes the seam more likely to occur at an inside or outside corner. Smart Hiding allows both inside and outside corners, but chooses inside corners more frequently, if appropriate.",
                     "type": "enum",
                     "options":
                     {