Trivial fixes in XML comments

And added an #if around using in RequestParameters.cs (worth having a
look, may have implications when building on different platforms)

Octokit.Reactive/Clients/ObservableFollowersClient.cs

@@ -28,7 +28,7 @@ namespace Octokit.Reactive
         /// <remarks>
         /// See the <a href="http://developer.github.com/v3/users/followers/#list-followers-of-a-user">API documentation</a> for more information.
         /// </remarks>
-        /// <returns>A <see cref="IReadOnlyList{User}"/> of <see cref="User"/>s that follow the authenticated user.</returns>
+        /// <returns>A <see cref="IObservable{User}"/> of <see cref="User"/>s that follow the authenticated user.</returns>
         public IObservable<User> GetAllForCurrent()
         {
             return _connection.GetAndFlattenAllPages<User>(ApiUrls.Followers());
@@ -41,7 +41,7 @@ namespace Octokit.Reactive
         /// <remarks>
         /// See the <a href="http://developer.github.com/v3/users/followers/#list-followers-of-a-user">API documentation</a> for more information.
         /// </remarks>
-        /// <returns>A <see cref="IReadOnlyList{User}"/> of <see cref="User"/>s that follow the passed user.</returns>
+        /// <returns>A <see cref="IObservable{User}"/> of <see cref="User"/>s that follow the passed user.</returns>
         public IObservable<User> GetAll(string login)
         {
             Ensure.ArgumentNotNullOrEmptyString(login, "login");
@@ -55,7 +55,7 @@ namespace Octokit.Reactive
         /// <remarks>
         /// See the <a href="http://developer.github.com/v3/users/followers/#list-users-followed-by-another-user">API documentation</a> for more information.
         /// </remarks>
-        /// <returns>A <see cref="IReadOnlyList{User}"/> of <see cref="User"/>s that the authenticated user follows.</returns>
+        /// <returns>A <see cref="IObservable{User}"/> of <see cref="User"/>s that the authenticated user follows.</returns>
         public IObservable<User> GetFollowingForCurrent()
         {
             return _connection.GetAndFlattenAllPages<User>(ApiUrls.Following());
@@ -68,7 +68,7 @@ namespace Octokit.Reactive
         /// <remarks>
         /// See the <a href="http://developer.github.com/v3/users/followers/#list-users-followed-by-another-user">API documentation</a> for more information.
         /// </remarks>
-        /// <returns>A <see cref="IReadOnlyList{User}"/> of <see cref="User"/>s that the passed user follows.</returns>
+        /// <returns>A <see cref="IObservable{User}"/> of <see cref="User"/>s that the passed user follows.</returns>
         public IObservable<User> GetFollowing(string login)
         {
             Ensure.ArgumentNotNullOrEmptyString(login, "login");

Octokit/Clients/IPullRequestsClient.cs

@@ -11,6 +11,7 @@ namespace Octokit
         /// </summary>
         IPullRequestReviewCommentsClient Comment { get; }
 
+        /// <summary>
         /// Get a pull request by number.
         /// </summary>
         /// <remarks>

Octokit/Clients/PullRequestsClient.cs

@@ -16,6 +16,7 @@ namespace Octokit
         /// </summary>
         public IPullRequestReviewCommentsClient Comment { get; private set; }
 
+        /// <summary>
         /// Get a pull request by number.
         /// </summary>
         /// <remarks>

Octokit/Models/Request/OauthTokenRequest.cs

@@ -38,7 +38,7 @@ namespace Octokit
         public string ClientSecret { get; private set; }
 
         /// <summary>
-        /// The code you received as a response to making the <see cref="IOAuthClient.CreateGitHubLoginUrl">OAuth login
+        /// The code you received as a response to making the <see cref="IOauthClient.CreateAccessToken">OAuth login
         /// request</see>.
         /// </summary>
         [Parameter(Key = "code")]

Octokit/Models/Request/RequestParameters.cs

@@ -1,5 +1,7 @@
 using System;
+#if !PORTABLE
 using System.Collections.Concurrent;
+#endif
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;