docs: add missing + fix docs in wrong place

src/decoder/symphonia.rs

@@ -208,6 +208,7 @@ impl Source for SymphoniaDecoder {
     }
 }
 
+/// Error returned when the try_seek implementation of the symphonia decoder fails.
 #[derive(Debug, thiserror::Error)]
 pub enum SeekError {
     /// Could not get next packet while refining seek position
@@ -225,7 +226,7 @@ pub enum SeekError {
 }
 
 impl SymphoniaDecoder {
-    /// note frame offset must be set after
+    /// Note frame offset must be set after
     fn refine_position(&mut self, seek_res: SeekedTo) -> Result<(), source::SeekError> {
         let mut samples_to_pass = seek_res.required_ts - seek_res.actual_ts;
         let packet = loop {

src/source/blt.rs

@@ -54,6 +54,7 @@ where
     }
 }
 
+/// This applies an audio filter, it can be a high or low pass filter.
 #[derive(Clone, Debug)]
 pub struct BltFilter<I> {
     input: I,

src/source/channel_volume.rs

@@ -25,6 +25,9 @@ where
     I: Source,
     I::Item: Sample,
 {
+    /// Wrap the input source and make it mono. Play that mono sound to each
+    /// channel at the volume set by the user. The volume can be changed using
+    /// [`ChannelVolume::set_volume`].
     pub fn new(mut input: I, channel_volumes: Vec<f32>) -> ChannelVolume<I>
     where
         I: Source,
@@ -48,8 +51,8 @@ where
         }
     }
 
-    /// Sets the volume for a given channel number.  Will panic if channel number
-    /// was invalid.
+    /// Sets the volume for a given channel number. Will panic if channel number
+    /// is invalid.
     pub fn set_volume(&mut self, channel: usize, volume: f32) {
         self.channel_volumes[channel] = volume;
     }

src/source/empty_callback.rs

@@ -7,7 +7,9 @@ use super::SeekError;
 
 /// An empty source which executes a callback function
 pub struct EmptyCallback<S> {
+    #[allow(missing_docs)] // See: https://github.com/RustAudio/rodio/issues/615
     pub phantom_data: PhantomData<S>,
+    #[allow(missing_docs)] // See: https://github.com/RustAudio/rodio/issues/615
     pub callback: Box<dyn Send + Fn()>,
 }
 
@@ -19,9 +21,7 @@ impl<S> EmptyCallback<S> {
     /// Detect and do something when the source before this one has ended.
     pub fn new(callback: Box<dyn Send + Fn()>) -> EmptyCallback<S> {
         EmptyCallback {
-            #[allow(missing_docs)] // See: https://github.com/RustAudio/rodio/issues/615
             phantom_data: PhantomData,
-            #[allow(missing_docs)] // See: https://github.com/RustAudio/rodio/issues/615
             callback,
         }
     }

src/source/mod.rs

@@ -465,7 +465,10 @@ where
 pub enum SeekError {
     /// On of the underlying sources does not support seeking
     #[error("Seeking is not supported by source: {underlying_source}")]
-    NotSupported { underlying_source: &'static str },
+    NotSupported { 
+        /// The source that did not support seek
+        underlying_source: &'static str 
+    },
     #[cfg(feature = "symphonia")]
     /// The symphonia decoder ran into an issue
     #[error("Error seeking: {0}")]