Update release docs

docs/releases.md

@@ -8,8 +8,8 @@ To retrieve all releases for a repository:
 var releases = await client.Repository.Release.GetAll("octokit", "octokit.net");
 var latest = releases[0];
 Console.WriteLine(
-    "The latest release is tagged at {0} and is named {1}", 
-    latest.TagName, 
+    "The latest release is tagged at {0} and is named {1}",
+    latest.TagName,
     latest.Name);
 ```
 
@@ -35,6 +35,14 @@ Note that the `Draft` flag is used to indicate when a release should be publishe
 GitHub can generate a name and body for a new release [automatically](https://github.blog/2021-10-04-beta-github-releases-improving-release-experience/#introducing-auto-generated-release-notes), based upon merged pull requests.
 [This is an example](https://github.com/MylesBorins/release-notes-test/releases/tag/v2.0.0) of automatically generated text.
 
+```csharp
+var newTag = "v1.5.7";
+var newRelease = new NewRelease(newTag);
+newRelease.GenerateReleaseNotes = true; // Set for Name and Body to be generated.
+newRelease.TargetCommitish = "main"; // Optional, can be a branch, tag, or SHA; defaults to the main branch.
+```
+
+#### Customizing generated notes
 ```csharp
 var newTag = "v1.5.7";
 var generationRequest = new GenerateReleaseNotesRequest(newTag);
@@ -68,7 +76,7 @@ If you have any assets to include with the release, you can upload them after cr
 
 ```csharp
 using(var archiveContents = File.OpenRead("output.zip")) { // TODO: better sample
-    var assetUpload = new ReleaseAssetUpload() 
+    var assetUpload = new ReleaseAssetUpload()
     {
          FileName = "my-cool-project-1.0.zip",
          ContentType = "application/zip",