fix small word dupe typos

Author: Rageking8

std/src/io/error/tests.rs

@@ -86,7 +86,7 @@ fn test_errorkind_packing() {
     assert_eq!(Error::from(ErrorKind::NotFound).kind(), ErrorKind::NotFound);
     assert_eq!(Error::from(ErrorKind::PermissionDenied).kind(), ErrorKind::PermissionDenied);
     assert_eq!(Error::from(ErrorKind::Uncategorized).kind(), ErrorKind::Uncategorized);
-    // Check that the innards look like like what we want.
+    // Check that the innards look like what we want.
     assert_matches!(
         Error::from(ErrorKind::OutOfMemory).repr.data(),
         ErrorData::Simple(ErrorKind::OutOfMemory),

std/src/sys/unix/kernel_copy.rs

@@ -20,7 +20,7 @@
 //! Since those syscalls have requirements that cannot be fully checked in advance and
 //! gathering additional information about file descriptors would require additional syscalls
 //! anyway it simply attempts to use them one after another (guided by inaccurate hints) to
-//! figure out which one works and and falls back to the generic read-write copy loop if none of them
+//! figure out which one works and falls back to the generic read-write copy loop if none of them
 //! does.
 //! Once a working syscall is found for a pair of file descriptors it will be called in a loop
 //! until the copy operation is completed.