Rollup merge of rust-lang#29169 - apasel422:spell, r=steveklabnik

r? @steveklabnik

src/doc/nomicon/safe-unsafe-meaning.md

@@ -42,7 +42,7 @@ Some examples of unsafe functions:
 * `slice::get_unchecked` will perform unchecked indexing, allowing memory
   safety to be freely violated.
 * every raw pointer to sized type has intrinsic `offset` method that invokes
-  Undefined Behaviour if it is not "in bounds" as defined by LLVM.
+  Undefined Behavior if it is not "in bounds" as defined by LLVM.
 * `mem::transmute` reinterprets some value as having the given type,
   bypassing type safety in arbitrary ways. (see [conversions] for details)
 * All FFI functions are `unsafe` because they can do arbitrary things.

src/libcollections/str.rs

@@ -102,7 +102,7 @@ impl<S: Borrow<str>> SliceConcatExt<str> for [S] {
     }
 }
 
-/// External iterator for a string's UTF16 codeunits.
+/// External iterator for a string's UTF-16 code units.
 ///
 /// For use with the `std::iter` module.
 #[derive(Clone)]

src/libcore/iter.rs

@@ -3248,7 +3248,7 @@ impl<T> Default for Empty<T> {
 
 /// Creates an iterator that yields nothing.
 ///
-/// # Exampes
+/// # Examples
 ///
 /// Basic usage:
 ///

src/libstd/process.rs

@@ -100,7 +100,7 @@ impl IntoInner<AnonPipe> for ChildStdin {
     fn into_inner(self) -> AnonPipe { self.inner }
 }
 
-/// A handle to a child procesess's stdout
+/// A handle to a child process's stdout
 #[stable(feature = "process", since = "1.0.0")]
 pub struct ChildStdout {
     inner: AnonPipe
@@ -121,7 +121,7 @@ impl IntoInner<AnonPipe> for ChildStdout {
     fn into_inner(self) -> AnonPipe { self.inner }
 }
 
-/// A handle to a child procesess's stderr
+/// A handle to a child process's stderr
 #[stable(feature = "process", since = "1.0.0")]
 pub struct ChildStderr {
     inner: AnonPipe