Minor comment fixups

futures-util/src/io/mod.rs

@@ -105,7 +105,7 @@ pub trait AsyncReadExt: AsyncRead {
     /// let bytes = await!(reader.read(&mut output[..]))?;
     ///
     /// // This is only guaranteed to be 4 because `&[u8]` is a synchronous
-    /// // reader, in a real system you could get anywhere from 1 to
+    /// // reader. In a real system you could get anywhere from 1 to
     /// // `output.len()` bytes in a single read.
     /// assert_eq!(bytes, 4);
     /// assert_eq!(output, [1, 2, 3, 4, 0]);
@@ -116,7 +116,7 @@ pub trait AsyncReadExt: AsyncRead {
     }
 
     /// Creates a future which will read exactly enough bytes to fill `buf`,
-    /// returning an error if EOF is hit sooner.
+    /// returning an error if end of file (EOF) is hit sooner.
     ///
     /// The returned future will resolve once the read operation is completed.
     ///
@@ -208,7 +208,7 @@ pub trait AsyncReadExt: AsyncRead {
     /// {
     ///     let mut writer = Cursor::new(&mut output[..]);
     ///     // Note that for `Cursor` the read and write halves share a single
-    ///     // seek position, this may or may not be true for other types that
+    ///     // seek position. This may or may not be true for other types that
     ///     // implement both `AsyncRead` and `AsyncWrite`.
     ///     let buffer_cursor = Cursor::new(&mut buffer[..]);
     ///     let (mut buffer_reader, mut buffer_writer) = buffer_cursor.split();