Fix some comments (#1095)

Signed-off-by: InventiveCoder <liucongcong@outlook.com>

crossbeam-channel/src/flavors/array.rs

@@ -243,7 +243,7 @@ impl<T> Channel<T> {
             let slot = unsafe { self.buffer.get_unchecked(index) };
             let stamp = slot.stamp.load(Ordering::Acquire);
 
-            // If the the stamp is ahead of the head by 1, we may attempt to pop.
+            // If the stamp is ahead of the head by 1, we may attempt to pop.
             if head + 1 == stamp {
                 let new = if index + 1 < self.cap {
                     // Same lap, incremented index.

crossbeam-channel/src/flavors/list.rs

@@ -584,7 +584,7 @@ impl<T> Channel<T> {
 
         let mut head = self.head.index.load(Ordering::Acquire);
         // The channel may be uninitialized, so we have to swap to avoid overwriting any sender's attempts
-        // to initalize the first block before noticing that the receivers disconnected. Late allocations
+        // to initialize the first block before noticing that the receivers disconnected. Late allocations
         // will be deallocated by the sender in Drop
         let mut block = self.head.block.swap(ptr::null_mut(), Ordering::AcqRel);
 

crossbeam-epoch/src/guard.rs

@@ -273,7 +273,7 @@ impl Guard {
     /// global cache.
     ///
     /// Call this method after deferring execution of a function if you want to get it executed as
-    /// soon as possible. Flushing will make sure it is residing in in the global cache, so that
+    /// soon as possible. Flushing will make sure it is residing in the global cache, so that
     /// any thread has a chance of taking the function and executing it.
     ///
     /// If this method is called from an [`unprotected`] guard, it is a no-op (nothing happens).

crossbeam-queue/src/array_queue.rs

@@ -290,7 +290,7 @@ impl<T> ArrayQueue<T> {
             let slot = unsafe { self.buffer.get_unchecked(index) };
             let stamp = slot.stamp.load(Ordering::Acquire);
 
-            // If the the stamp is ahead of the head by 1, we may attempt to pop.
+            // If the stamp is ahead of the head by 1, we may attempt to pop.
             if head + 1 == stamp {
                 let new = if index + 1 < self.cap {
                     // Same lap, incremented index.

crossbeam-utils/src/thread.rs

@@ -500,7 +500,7 @@ pub struct ScopedJoinHandle<'scope, T> {
     /// Holds the result of the inner closure.
     result: SharedOption<T>,
 
-    /// A handle to the the spawned thread.
+    /// A handle to the spawned thread.
     thread: thread::Thread,
 
     /// Borrows the parent scope with lifetime `'scope`.