Fixed more typos in library/core

Author: ranger-ross

core/src/array/mod.rs

@@ -37,7 +37,7 @@ pub use iter::IntoIter;
 ///
 /// # Example
 ///
-/// Creating muliple copies of a `String`:
+/// Creating multiple copies of a `String`:
 /// ```rust
 /// #![feature(array_repeat)]
 ///

core/src/future/async_drop.rs

@@ -157,7 +157,7 @@ async unsafe fn surface_drop_in_place<T: Drop + ?Sized>(ptr: *mut T) {
     unsafe { crate::ops::fallback_surface_drop(&mut *ptr) }
 }
 
-/// Wraps a future to continue outputing `Poll::Ready(())` once after
+/// Wraps a future to continue outputting `Poll::Ready(())` once after
 /// wrapped future completes by returning `Poll::Ready(())` on poll. This
 /// is useful for constructing async destructors to guarantee this
 /// "fuse" property
@@ -223,7 +223,7 @@ where
 /// # Safety
 ///
 /// Same as `async_drop_in_place` except is lazy to avoid creating
-/// multiple mutable refernces.
+/// multiple mutable references.
 #[lang = "async_drop_defer"]
 async unsafe fn defer<T: ?Sized>(to_drop: *mut T) {
     // SAFETY: same safety requirements as `async_drop_in_place`

core/src/intrinsics/mir.rs

@@ -310,7 +310,7 @@ define!(
 );
 define!(
     "mir_unwind_cleanup",
-    /// An unwind action that continues execution in a given basic blok.
+    /// An unwind action that continues execution in a given basic block.
     fn UnwindCleanup(goto: BasicBlock) -> UnwindActionArg
 );
 

core/src/macros/mod.rs

@@ -1072,7 +1072,7 @@ pub(crate) mod builtin {
     /// If the environment variable is not defined, then a compilation error
     /// will be emitted. To not emit a compile error, use the [`option_env!`]
     /// macro instead. A compilation error will also be emitted if the
-    /// environment variable is not a vaild Unicode string.
+    /// environment variable is not a valid Unicode string.
     ///
     /// # Examples
     ///