feat: error messages for ParseGuildVCToTextChannelError

src/main.rs

@@ -75,18 +75,23 @@ impl From<AudioSampleRate> for SampleRate {
 
 #[derive(Debug, Snafu)]
 enum ParseGuildVCToTextChannelError {
+    /// the guild ID needs to be included with : before the voice channel to text channel mapping
     NoScope,
 
+    /// a voice channel ID needs to be specified then -> to the corresponding text channel ID
     NoRelation,
 
+    /// could not parse the guild ID
     ParseGuildError {
         source: <Id<GuildMarker> as FromStr>::Err,
     },
 
+    /// could not parse the voice channel ID
     ParseVoiceChannelError {
         source: <Id<ChannelMarker> as FromStr>::Err,
     },
 
+    /// could not parse the text channel ID
     ParseTextChannelError {
         source: <Id<ChannelMarker> as FromStr>::Err,
     },