Fix code docs

Author: rohitsangwan01

lib/platform_channels.dart

@@ -51,7 +51,7 @@ class MethodNames {
   /// method name for [resume]
   static const String resume = 'resume';
 
-  /// method name for [podcastPlaybackSpeed]
+  /// method name for [setPodcastPlaybackSpeed]
   static const String setPodcastPlaybackSpeed = 'setPodcastPlaybackSpeed';
 
   /// method name for [skipToIndex]

lib/spotify_sdk.dart

@@ -632,7 +632,7 @@ class SpotifySdk {
 
   /// Sets the repeat mode
   ///
-  /// Set [repeatMode] to a value of [RepeatMode] either [off, track, context].
+  /// Set [repeatMode] to a value of [RepeatMode].
   /// Throws a [PlatformException] if adding failed
   /// Throws a [MissingPluginException] if the method is not implemented on
   /// the native platforms.