Update and fix comments for the documentation

src/Avalonia.Visuals/Point.cs

@@ -269,10 +269,10 @@ namespace Avalonia
         }
 
         /// <summary>
-        /// Deconstructor for decomposition Point
+        /// Deconstructs the point into it's X and Y coordinates.
         /// </summary>
-        /// <param name="x">The X position.</param>
-        /// <param name="y">The Y position.</param>
+        /// <param name="x">The X coordinate.</param>
+        /// <param name="y">The Y coordinate.</param>
         public void Deconstruct(out double x, out double y)
         {
             x = this._x;
@@ -280,7 +280,7 @@ namespace Avalonia
         }
 
         /// <summary>
-        /// Gets a value indicating that point coordinates are zero
+        /// Gets a value indicating whether the X and Y coordinates are zero.
         /// </summary>
         public bool IsDefault
         {

src/Avalonia.Visuals/Size.cs

@@ -278,7 +278,7 @@ namespace Avalonia
         }
 
         /// <summary>
-        /// Deconstructor for decomposition Size
+        /// Deconstructs the size into it's Width and Height values.
         /// </summary>
         /// <param name="width">The width.</param>
         /// <param name="height">The height.</param>
@@ -289,7 +289,7 @@ namespace Avalonia
         }
 
         /// <summary>
-        /// Gets a value indicating that width and height are zero
+        /// Gets a value indicating whether the Width and Height values are zero.
         /// </summary>
         public bool IsDefault
         {

src/Avalonia.Visuals/Thickness.cs

@@ -274,7 +274,7 @@ namespace Avalonia
         }
 
         /// <summary>
-        /// Deconstructor for decomposition Thickness
+        /// Deconstructor the thickness into left, top, right and bottom thickness values.
         /// </summary>
         /// <param name="left">The thickness on the left.</param>
         /// <param name="top">The thickness on the top.</param>
@@ -289,7 +289,7 @@ namespace Avalonia
         }
 
         /// <summary>
-        /// Gets a value indicating that thickness are zero
+        /// Gets a value indicating whether the left, top, right and bottom thickness values are zero.
         /// </summary>
         public bool IsDefault
         {

src/Avalonia.Visuals/Vector.cs

@@ -335,10 +335,10 @@ namespace Avalonia
             => new Vector(0, 1);
 
         /// <summary>
-        /// Deconstructor for decomposition Vector
+        /// Deconstructs the vector into it's X and Y components.
         /// </summary>
         /// <param name="x">The X component.</param>
-        /// <param name="y">The Y poscomponentition.</param>
+        /// <param name="y">The Y component.</param>
         public void Deconstruct(out double x, out double y)
         {
             x = this._x;
@@ -346,7 +346,7 @@ namespace Avalonia
         }
 
         /// <summary>
-        /// Gets a value indicating that Vector components are zero
+        /// Gets a value indicating whether the X and Y components are zero.
         /// </summary>
         public bool IsDefault
         {