update description and examples (#18981)

Author: forteddyt

specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/preview/2022-02-01-preview/mfe.json

@@ -8988,9 +8988,9 @@
           "x-nullable": true
         },
         "tileGridSize": {
-          "description": "The grid size to use for tiling each image. Note: TileGridSize must not be\r\nNone to enable small object detection logic A tuple of two integers passed as a string.\r\nNote: This settings is not supported for the 'yolov5' algorithm.",
+          "description": "The grid size to use for tiling each image. Note: TileGridSize must not be\r\nNone to enable small object detection logic. A string containing two integers in mxn format.\r\nNote: This settings is not supported for the 'yolov5' algorithm.",
           "type": "string",
-          "example": "choice('[3;2]', '[2;2]')",
+          "example": "choice('3x2', '2x2')",
           "x-nullable": true
         },
         "tileOverlapRatio": {
@@ -9312,9 +9312,9 @@
           "x-nullable": true
         },
         "tileGridSize": {
-          "description": "The grid size to use for tiling each image. Note: TileGridSize must not be\r\nNone to enable small object detection logic. A tuple of two integers passed as a string.\r\nNote: This settings is not supported for the 'yolov5' algorithm.",
+          "description": "The grid size to use for tiling each image. Note: TileGridSize must not be\r\nNone to enable small object detection logic. A string containing two integers in mxn format.\r\nNote: This settings is not supported for the 'yolov5' algorithm.",
           "type": "string",
-          "example": "[3;2]",
+          "example": "3x2",
           "x-nullable": true
         },
         "tileOverlapRatio": {