Fixed typo

Author: sakno

src/DotNext/Optional.cs

@@ -38,7 +38,7 @@ public static class Optional
 
     /// <summary>
     /// If a value is present, apply the provided mapping function to it, and if the result is
-    /// non-null, return an Optional describing the result. Otherwise returns <see cref="Optional{T}.None"/>.
+    /// non-null, return an Optional describing the result. Otherwise, returns <see cref="Optional{T}.None"/>.
     /// </summary>
     /// <typeparam name="TInput">The type of stored in the Optional container.</typeparam>
     /// <typeparam name="TOutput">The type of the result of the mapping function.</typeparam>

src/DotNext/Threading/Tasks/Synchronization.cs

@@ -209,7 +209,7 @@ public static Result<TResult> GetResult<TResult>(this Task<TResult> task, Cancel
     }
 
     /// <summary>
-    /// Creates a task that will complete when all of the passed tasks have completed.
+    /// Creates a task that will complete when all the passed tasks have completed.
     /// </summary>
     /// <typeparam name="T1">The type of the first task.</typeparam>
     /// <typeparam name="T2">The type of the second task.</typeparam>
@@ -264,7 +264,7 @@ public static Result<TResult> GetResult<TResult>(this Task<TResult> task, Cancel
     }
 
     /// <summary>
-    /// Creates a task that will complete when all of the passed tasks have completed.
+    /// Creates a task that will complete when all the passed tasks have completed.
     /// </summary>
     /// <typeparam name="T1">The type of the first task.</typeparam>
     /// <typeparam name="T2">The type of the second task.</typeparam>