Update comments to follow cpal` 0.7 convention

src/conversions/channels.rs

@@ -1,6 +1,6 @@
 use cpal;
 
-/// Iterator that converts from a certain channels count to another.
+/// Iterator that converts from a certain channel count to another.
 #[derive(Clone, Debug)]
 pub struct ChannelCountConverter<I>
     where I: Iterator

src/conversions/mod.rs

@@ -1,7 +1,7 @@
 /*!
 This module contains function that will convert from one PCM format to another.
 
-This includes conversion between samples formats, channels or sample rates.
+This includes conversion between sample formats, channels or sample rates.
 
 */
 

src/conversions/sample_rate.rs

@@ -4,7 +4,7 @@ use cpal;
 
 use std::mem;
 
-/// Iterator that converts from a certain samples rate to another.
+/// Iterator that converts from a certain sample rate to another.
 #[derive(Clone, Debug)]
 pub struct SampleRateConverter<I>
     where I: Iterator