chore: fix some minor issues in the comments

src/io/mod.rs

@@ -61,7 +61,7 @@ pub trait Read {
     /// If the return value of this method is [`Ok(n)`], then it must be
     /// guaranteed that `0 <= n <= buf.len()`. A nonzero `n` value indicates
     /// that the buffer `buf` has been filled in with `n` bytes of data from this
-    /// source. If `n` is `0`, then it can indicate that the the buffer
+    /// source. If `n` is `0`, then it can indicate that the buffer
     /// specified was 0 bytes in length.
     ///
     /// No guarantees are provided about the contents of `buf` when this

src/iterable/rev.rs

@@ -4,7 +4,7 @@ use crate::iter::Rev;
 /// Stream that goes over an `[ExactSizeIterator]` in reverse order.
 ///
 /// This stream allows to switch fast from little endian ordering used in
-/// time-efficient algorithms, e.g. in slices `&[T]` into big endia ordering
+/// time-efficient algorithms, e.g. in slices `&[T]` into big endian ordering
 /// (used in space-efficient algorithms.
 ///
 /// # Examples