epoll: fix comment typo

src/shims/unix/linux/epoll.rs

@@ -539,7 +539,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                     )?;
                     if is_updated {
                         // Edge-triggered notification only notify one thread even if there are
-                        // multiple threads block on the same epfd.
+                        // multiple threads blocked on the same epfd.
 
                         // This unwrap can never fail because if the current epoll instance were
                         // closed, the upgrade of weak_epoll_interest

tests/fail-dep/libc/eventfd_block_read_twice.rs

@@ -14,7 +14,7 @@ use std::thread;
 // 2. Thread 2 blocks.
 // 3. Thread 3 unblocks both thread 1 and thread 2.
 // 4. Thread 1 reads.
-// 5. Thread 2's `read` can neber complete -> deadlocked.
+// 5. Thread 2's `read` can never complete -> deadlocked.
 
 fn main() {
     // eventfd write will block when EFD_NONBLOCK flag is clear