Fix typo in "Loops" section of the book

Closes rust-lang#31195

src/doc/book/loops.md

@@ -195,7 +195,7 @@ for x in 0..10 {
 You may also encounter situations where you have nested loops and need to
 specify which one your `break` or `continue` statement is for. Like most
 other languages, by default a `break` or `continue` will apply to innermost
-loop. In a situation where you would like to a `break` or `continue` for one
+loop. In a situation where you would like to `break` or `continue` for one
 of the outer loops, you can use labels to specify which loop the `break` or
  `continue` statement applies to. This will only print when both `x` and `y` are
  odd: