mark some elements as inline code

Author: funkill

src/SUMMARY.md

@@ -152,7 +152,7 @@
 - [Error handling](error.md)
     - [`panic`](error/panic.md)
     - [`Option` & `unwrap`](error/option_unwrap.md)
-        - [Unpacking options with ?](error/option_unwrap/question_mark.md)
+        - [Unpacking options with `?`](error/option_unwrap/question_mark.md)
         - [Combinators: `map`](error/option_unwrap/map.md)
         - [Combinators: `and_then`](error/option_unwrap/and_then.md)
     - [`Result`](error/result.md)

src/error/option_unwrap/question_mark.md

@@ -1,17 +1,20 @@
-# Unpacking options with ?
+# Unpacking options with `?`
 
-You can unpack Options by using `match` statements, but it's often easier to use the `?` operator. If `x` is an `Option`, then evaluating `x?` will return the underlying value if `x` is Some, otherwise it will terminate whatever function is being executed and return `None`. 
+You can unpack `Option`s by using `match` statements, but it's often easier to
+use the `?` operator. If `x` is an `Option`, then evaluating `x?` will return
+the underlying value if `x` is `Some`, otherwise it will terminate whatever
+function is being executed and return `None`.
 
 ```rust,editable
 fn next_birthday(current_age: Option<u8>) -> Option<String> {
-	// If `current_age` is None, this returns None.
-	// If `current_age` is Some, the inner u8 gets assigned to `next_age`
+	// If `current_age` is `None`, this returns `None`.
+	// If `current_age` is `Some`, the inner `u8` gets assigned to `next_age`
     let next_age: u8 = current_age?;
     Some(format!("Next year I will be {}", next_age))
 }
 ```
 
-You can chain many ?s together to make your code much more readable.
+You can chain many `?`s together to make your code much more readable.
 
 ```rust,editable
 struct Person {
@@ -30,10 +33,10 @@ struct PhoneNumber {
 }
 
 impl Person {
-    
+
     // Gets the area code of the phone number of the person's job, if it exists.
     fn work_phone_area_code(&self) -> Option<u8> {
-        // This would need many nested `match` statements without the ? operator.
+        // This would need many nested `match` statements without the `?` operator.
         // It would take a lot more code - try writing it yourself and see which
         // is easier.
         self.job?.phone_number?.area_code
@@ -52,4 +55,4 @@ fn main() {
 
     assert_eq!(p.work_phone_area_code(), Some(61));
 }
-```
+```