Fix docstring spelling mistakes

Author: dralley

src/libcore/macros.rs

@@ -350,9 +350,8 @@ macro_rules! try {
 /// assert_eq!(v, b"s = \"abc 123\"");
 /// ```
 ///
-/// Note: This macro can be used in `no_std` setups as well
-/// In a `no_std` setup you are responsible for the
-/// implementation details of the components.
+/// Note: This macro can be used in `no_std` setups as well.
+/// In a `no_std` setup you are responsible for the implementation details of the components.
 ///
 /// ```no_run
 /// # extern crate core;
@@ -440,7 +439,7 @@ macro_rules! writeln {
 ///
 /// If the determination that the code is unreachable proves incorrect, the
 /// program immediately terminates with a [`panic!`].  The function [`unreachable_unchecked`],
-/// which belongs to the [`std::hint`] module, informs the compilier to
+/// which belongs to the [`std::hint`] module, informs the compiler to
 /// optimize the code out of the release version entirely.
 ///
 /// [`panic!`]:  ../std/macro.panic.html

src/libcore/pin.rs

@@ -3,7 +3,7 @@
 //! It is sometimes useful to have objects that are guaranteed to not move,
 //! in the sense that their placement in memory does not change, and can thus be relied upon.
 //!
-//! A prime example of such a scenario would be building self-referencial structs,
+//! A prime example of such a scenario would be building self-referential structs,
 //! since moving an object with pointers to itself will invalidate them,
 //! which could cause undefined behavior.
 //!
@@ -39,7 +39,7 @@
 //! use std::marker::Pinned;
 //! use std::ptr::NonNull;
 //!
-//! // This is a self referencial struct since the slice field points to the data field.
+//! // This is a self-referential struct since the slice field points to the data field.
 //! // We cannot inform the compiler about that with a normal reference,
 //! // since this pattern cannot be described with the usual borrowing rules.
 //! // Instead we use a raw pointer, though one which is known to not be null,