[NUI][VisualFittingModeType] update documentation (#2648)

update description for Center,Fill modes

Co-authored-by: Jiyun Yang <ji.yang@samsung.com>

diff --git a/src/Tizen.NUI/src/public/Visuals/VisualConstants.cs b/src/Tizen.NUI/src/public/Visuals/VisualConstants.cs
index 82d65c9..c1a7dd5 100755 (executable)
--- a/src/Tizen.NUI/src/public/Visuals/VisualConstants.cs
+++ b/src/Tizen.NUI/src/public/Visuals/VisualConstants.cs
@@ -150,12 +150,12 @@ namespace Tizen.NUI
         /// </summary>
         FitHeight,
         /// <summary>
-        /// Thumbnail gallery grid: Limit loaded image resolution to screen tile using the Center mode.
+        /// Image displayed in its original size (no scaling) using the Center mode.
         /// </summary>
         [EditorBrowsable(EditorBrowsableState.Never)]
         Center,
         /// <summary>
-        /// Thumbnail gallery grid: Limit loaded image resolution to screen tile using the ScaleToFill mode.
+        /// Image stretched to fill the desired area (aspect ratio could be changed) using the Fill mode.
         /// </summary>
         [EditorBrowsable(EditorBrowsableState.Never)]
         Fill