Add NewRelease.GenerateReleaseNotes property (#2596)

* Add `GenerateReleaseNotes` property

Enable generating release notes during creation of a release.

* Update release docs

Octokit/Models/Request/NewRelease.cs

@@ -7,7 +7,7 @@ namespace Octokit
     /// Used to create a new release.
     /// </summary>
     /// <remarks>
-    /// API: https://developer.github.com/v3/repos/releases/#create-a-release
+    /// API: https://docs.github.com/rest/releases/releases#create-a-release
     /// </remarks>
     [DebuggerDisplay("{DebuggerDisplay,nq}")]
     public class NewRelease
@@ -73,6 +73,17 @@ public NewRelease(string tagName)
         /// </value>
         public bool Prerelease { get; set; }
 
+        /// <summary>
+        /// Gets or sets a value indicating whether to automatically generate the name and body for this release.
+        /// If <see cref="Name">name</see> is specified, the specified name will be used; otherwise, a name will
+        /// be automatically generated. If <see cref="Body">body</see> is specified, the body will be pre-pended to the
+        /// automatically generated notes.
+        /// </summary>
+        /// <value>
+        ///   <c>true</c> to generate release notes; otherwise, <c>false</c>.
+        /// </value>
+        public bool GenerateReleaseNotes { get; set; }
+
         internal string DebuggerDisplay
         {
             get
@@ -81,4 +92,4 @@ internal string DebuggerDisplay
             }
         }
     }
-}
+}

Octokit/Models/Request/ReleaseUpdate.cs

@@ -7,7 +7,7 @@ namespace Octokit
     /// Used to update a release.
     /// </summary>
     /// <remarks>
-    /// API: https://developer.github.com/v3/repos/releases/#create-a-release
+    /// API: https://docs.github.com/rest/releases/releases#update-a-release
     /// </remarks>
     [DebuggerDisplay("{DebuggerDisplay,nq}")]
     public class ReleaseUpdate
@@ -47,7 +47,7 @@ public class ReleaseUpdate
         public string Body { get; set; }
 
         /// <summary>
-        /// Gets or sets a value indicating whether this <see cref="NewRelease"/> is a draft (unpublished).
+        /// Gets or sets a value indicating whether this <see cref="ReleaseUpdate"/> is a draft (unpublished).
         /// Default: false
         /// </summary>
         /// <value>
@@ -56,7 +56,7 @@ public class ReleaseUpdate
         public bool? Draft { get; set; }
 
         /// <summary>
-        /// Gets or sets a value indicating whether this <see cref="NewRelease"/> is prerelease.
+        /// Gets or sets a value indicating whether this <see cref="ReleaseUpdate"/> is prerelease.
         /// </summary>
         /// <value>
         ///   <c>true</c> if prerelease; otherwise, <c>false</c>.

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);
@@ -47,7 +55,7 @@ newRelease.Name = releaseNotes.Name;
 newRelease.Body = releaseNotes.Body;
 ```
 
-This feature can be customized at the repository level, by following [these instructions](https://docs.github.com/en/repositories/releasing-projects-on-github/automatically-generated-release-notes#configuring-automatically-generated-release-notes).
+This feature can be customized at the repository level, by following [these instructions](https://docs.github.com/repositories/releasing-projects-on-github/automatically-generated-release-notes#configuring-automatically-generated-release-notes).
 
 ### Update
 
@@ -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",