Typo fixes

src/expressions/match-expr.md

@@ -113,7 +113,7 @@ let message = match maybe_digit {
 ```
 
 > Note: Multiple matches using the `|` operator can cause the pattern guard and
-> and side effects it has to execute multiple times. For example:
+> the side effects it has to execute multiple times. For example:
 >
 > ```rust
 > # use std::cell::Cell;

src/expressions/operator-expr.md

@@ -93,7 +93,7 @@ Dereferencing a raw pointer requires `unsafe`.
 
 On non-pointer types `*x` is equivalent to `*std::ops::Deref::deref(&x)` in an
 [immutable place expression context](expressions.html#mutability) and
-`*std::ops::Deref::deref_mut(&mut x)` in a mutable place expression context.
+`*std::ops::DerefMut::deref_mut(&mut x)` in a mutable place expression context.
 
 ```rust
 let x = &7;
@@ -131,7 +131,7 @@ println!("{:?}", res);
 # assert!(res.is_err())
 ```
 
-When applied to values of the `Option<T>` type, it propagates `Nones`. If the
+When applied to values of the `Option<T>` type, it propagates `None`s. If the
 value is `None`, then it will return `None`. If applied to `Some(x)`, then it
 will unwrap the value to evaluate to `x`.
 

src/type-layout.md

@@ -205,7 +205,7 @@ The union will have a size of the maximum size of all of its fields rounded to
 its alignment, and an alignment of the maximum alignment of all of its fields.
 These maximums may come from different fields.
 
-```
+```rust
 #[repr(C)]
 union Union {
     f1: u16,

src/types/trait-object.md

@@ -17,7 +17,7 @@ of the base trait.
 Trait objects are written as the optional keyword `dyn` followed by a set of
 trait bounds, but with the following restrictions on the trait bounds. All
 traits except the first trait must be auto traits, there may not be more than
-one lifetime, and opt-out bounds (e.g. `?sized`) are not allowed. Furthermore,
+one lifetime, and opt-out bounds (e.g. `?Sized`) are not allowed. Furthermore,
 paths to traits may be parenthesized.
 
 For example, given a trait `Trait`, the following are all trait objects: