Spelling and grammar fixes (#13701)

src/Avalonia.Base/Threading/Dispatcher.Invoke.cs

@@ -120,7 +120,7 @@ public partial class Dispatcher
     ///     Executes the specified Func<TResult> synchronously on the
     ///     thread that the Dispatcher was created on.
     /// </summary>
-    /// <typeparam name="TResult">The type of retuturn value of <paramref name="callback"/></typeparam>
+    /// <typeparam name="TResult">The type of the <paramref name="callback"/> return value.</typeparam>
     /// <param name="callback">
     ///     A Func&lt;TResult&gt; delegate to invoke through the dispatcher.
     /// </param>
@@ -139,7 +139,7 @@ public partial class Dispatcher
     ///     Executes the specified Func&lt;TResult&gt; synchronously on the
     ///     thread that the Dispatcher was created on.
     /// </summary>
-    /// <typeparam name="TResult">The type of retuturn value of <paramref name="callback"/></typeparam>
+    /// <typeparam name="TResult">The type of the <paramref name="callback"/> return value.</typeparam>
     /// <param name="callback">
     ///     A Func&lt;TResult&gt; delegate to invoke through the dispatcher.
     /// </param>
@@ -160,7 +160,7 @@ public partial class Dispatcher
     ///     Executes the specified Func&lt;TResult&gt; synchronously on the
     ///     thread that the Dispatcher was created on.
     /// </summary>
-    /// <typeparam name="TResult">The type of retuturn value of <paramref name="callback"/></typeparam>
+    /// <typeparam name="TResult">The type of the <paramref name="callback"/> return value.</typeparam>
     /// <param name="callback">
     ///     A Func&lt;TResult&gt; delegate to invoke through the dispatcher.
     /// </param>
@@ -188,7 +188,7 @@ public partial class Dispatcher
     ///     Executes the specified Func&lt;TResult&gt; synchronously on the
     ///     thread that the Dispatcher was created on.
     /// </summary>
-    /// <typeparam name="TResult">The type of retuturn value of <paramref name="callback"/></typeparam>
+    /// <typeparam name="TResult">The type of the <paramref name="callback"/> return value.</typeparam>
     /// <param name="callback">
     ///     A Func&lt;TResult&gt; delegate to invoke through the dispatcher.
     /// </param>
@@ -323,7 +323,7 @@ public partial class Dispatcher
     ///     Executes the specified Func&lt;TResult&gt; asynchronously on the
     ///     thread that the Dispatcher was created on.
     /// </summary>
-    /// <typeparam name="TResult">The type of retuturn value of <paramref name="callback"/></typeparam>
+    /// <typeparam name="TResult">The type of the <paramref name="callback"/> return value.</typeparam>
     /// <param name="callback">
     ///     A Func&lt;TResult&gt; delegate to invoke through the dispatcher.
     /// </param>
@@ -362,7 +362,7 @@ public partial class Dispatcher
     ///     Executes the specified Func&lt;TResult&gt; asynchronously on the
     ///     thread that the Dispatcher was created on.
     /// </summary>
-    /// <typeparam name="TResult">The type of retuturn value of <paramref name="callback"/></typeparam>
+    /// <typeparam name="TResult">The type of the <paramref name="callback"/> return value.</typeparam>
     /// <param name="callback">
     ///     A Func&lt;TResult&gt; delegate to invoke through the dispatcher.
     /// </param>