Auto merge of #38015 - sanxiyn:rollup, r=sanxiyn

Rollup of 7 pull requests

- Successful merges: #37962, #37963, #37967, #37978, #37985, #38001, #38010
- Failed merges:

3 files changed, 27 insertions, 6 deletions

diff --git a/src/libstd/sync/mpsc/mod.rs b/src/libstd/sync/mpsc/mod.rs
index 2773629c7d7..ca6e46eb15a 100644
--- a/src/libstd/sync/mpsc/mod.rs
+++ b/src/libstd/sync/mpsc/mod.rs
@@ -491,11 +491,11 @@ pub fn channel<T>() -> (Sender<T>, Receiver<T>) {
 /// becomes available. These channels differ greatly in the semantics of the
 /// sender from asynchronous channels, however.
 ///
-/// This channel has an internal buffer on which messages will be queued. When
-/// the internal buffer becomes full, future sends will *block* waiting for the
-/// buffer to open up. Note that a buffer size of 0 is valid, in which case this
-/// becomes  "rendezvous channel" where each send will not return until a recv
-/// is paired with it.
+/// This channel has an internal buffer on which messages will be queued. `bound`
+/// specifies the buffer size. When the internal buffer becomes full, future sends
+/// will *block* waiting for the buffer to open up. Note that a buffer size of 0
+/// is valid, in which case this becomes  "rendezvous channel" where each send will
+/// not return until a recv is paired with it.
 ///
 /// As with asynchronous channels, all senders will panic in `send` if the
 /// `Receiver` has been destroyed.
diff --git a/src/libstd/sync/mutex.rs b/src/libstd/sync/mutex.rs
index 812724c7a16..df4a3746a49 100644
--- a/src/libstd/sync/mutex.rs
+++ b/src/libstd/sync/mutex.rs
@@ -133,7 +133,14 @@ unsafe impl<T: ?Sized + Send> Sync for Mutex<T> { }
 /// dropped (falls out of scope), the lock will be unlocked.
 ///
 /// The data protected by the mutex can be access through this guard via its
-/// `Deref` and `DerefMut` implementations
+/// `Deref` and `DerefMut` implementations.
+///
+/// This structure is created by the [`lock()`] and [`try_lock()`] methods on
+/// [`Mutex`].
+///
+/// [`lock()`]: struct.Mutex.html#method.lock
+/// [`try_lock()`]: struct.Mutex.html#method.try_lock
+/// [`Mutex`]: struct.Mutex.html
 #[must_use]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct MutexGuard<'a, T: ?Sized + 'a> {
diff --git a/src/libstd/sync/rwlock.rs b/src/libstd/sync/rwlock.rs
index f08b7641521..f83cf7ba9c2 100644
--- a/src/libstd/sync/rwlock.rs
+++ b/src/libstd/sync/rwlock.rs
@@ -77,6 +77,13 @@ unsafe impl<T: ?Sized + Send + Sync> Sync for RwLock<T> {}
 
 /// RAII structure used to release the shared read access of a lock when
 /// dropped.
+///
+/// This structure is created by the [`read()`] and [`try_read()`] methods on
+/// [`RwLock`].
+///
+/// [`read()`]: struct.RwLock.html#method.read
+/// [`try_read()`]: struct.RwLock.html#method.try_read
+/// [`RwLock`]: struct.RwLock.html
 #[must_use]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct RwLockReadGuard<'a, T: ?Sized + 'a> {
@@ -88,6 +95,13 @@ impl<'a, T: ?Sized> !marker::Send for RwLockReadGuard<'a, T> {}
 
 /// RAII structure used to release the exclusive write access of a lock when
 /// dropped.
+///
+/// This structure is created by the [`write()`] and [`try_write()`] methods
+/// on [`RwLock`].
+///
+/// [`write()`]: struct.RwLock.html#method.write
+/// [`try_write()`]: struct.RwLock.html#method.try_write
+/// [`RwLock`]: struct.RwLock.html
 #[must_use]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct RwLockWriteGuard<'a, T: ?Sized + 'a> {