Added comments to Function

To be honest, I still don't understand exactly what's happening here. All I know is that it's at least somewhat understandable what's going on here.

Author: GueLaKais

rosidl_runtime_rs/src/sequence.rs

@@ -111,6 +111,18 @@ impl<T: SequenceAlloc> Clone for Sequence<T> {
 }
 
 impl<T: Debug + SequenceAlloc> Debug for Sequence<T> {
+    /// Formats the sequence using the given formatter.
+    ///
+    /// This implementation formats the sequence as a slice of its elements.
+    ///
+    /// # Arguments
+    ///
+    /// * `&self` - The sequence to be formatted.
+    /// * `f` - The formatter to use for formatting the sequence.
+    ///
+    /// # Returns
+    ///
+    /// A `Result` containing the formatted sequence or an error if formatting failed.
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
         self.as_slice().fmt(f)
     }