Fix typos and improve code/documentation clarity

Corrected typos in method names in `PropagationTests.cs` and `SourceTests.cs`. Added `PropagationTests` and `SourceTests` classes. Adjusted XML documentation alignment for `taskCreationOptions` in `Extensions.ReadConcurrently.cs`. Simplified lambda expression in `ReadUntilCancelledAsync` for improved readability.

Author: electricessence

Open.ChannelExtensions.Tests/PropagationTests.cs

@@ -1,8 +1,9 @@
 namespace Open.ChannelExtensions.Tests;
+
 public static class PropagationTests
 {
 	[Fact]
-	public static async Task PropagateCompleteionTest()
+	public static async Task PropagateCompletionTest()
 	{
 		var inputChannel = Channel.CreateBounded<int>(100);
 		var outputChannel = Channel.CreateBounded<int>(100);

Open.ChannelExtensions.Tests/SourceTests.cs

@@ -1,8 +1,9 @@
 namespace Open.ChannelExtensions.Tests;
+
 public static class SourceTests
 {
 	[Fact]
-	public static async Task ToChannelCancelledAfterwriteStarts()
+	public static async Task ToChannelCancelledAfterWriteStarts()
 	{
 		var cts = new CancellationTokenSource();
 		ChannelReader<int> reader = Enumerable.Range(0, 10_000).ToChannel(10, true, cts.Token);

Open.ChannelExtensions/Extensions.ReadConcurrently.cs

@@ -8,8 +8,8 @@ public static partial class Extensions
 	/// <typeparam name="T">The item type.</typeparam>
 	/// <param name="reader">The channel reader to read from.</param>
 	/// <param name="maxConcurrency">The maximum number of concurrent operations.  Greater than 1 may likely cause results to be out of order.</param>
-	/// <param name="taskCreationOptions">The task creation options to use.</param>
 	/// <param name="scheduler">The task scheduler to use.</param>
+	/// <param name="taskCreationOptions">The task creation options to use.</param>
 	/// <param name="receiver">The async receiver function.</param>
 	/// <param name="cancellationToken">The cancellation token.</param>
 	/// <returns>A task that completes when no more reading is to be done.</returns>
@@ -83,7 +83,7 @@ async Task<long> Read()
 			{
 				try
 				{
-					return await reader.ReadUntilCancelledAsync(token, (T item, long _) => receiver(item), true).ConfigureAwait(false);
+					return await reader.ReadUntilCancelledAsync(token, (item, _) => receiver(item), true).ConfigureAwait(false);
 				}
 				catch (Exception ex)
 				{