Part 9b: fix prose to match the code snippet

jtlehtinen · jtlehtinen · commit 0003f6e7efc0 · 2023-02-27T20:45:19.000+02:00
diff --git a/src/content/9/en/part9b.md b/src/content/9/en/part9b.md
@@ -279,7 +279,7 @@ try {
 }
 ```
 
-Here the narrowing was done with a [typeof](https://www.typescriptlang.org/docs/handbook/2/narrowing.html#typeof-type-guards) type guard, that is just one of the many ways to narrow a type. We shall see many others later in this part.
+Here the narrowing was done with the [instanceof](https://www.typescriptlang.org/docs/handbook/2/narrowing.html#instanceof-narrowing) type guard, that is just one of the many ways to narrow a type. We shall see many others later in this part.
 
 ### Accessing command line arguments
 

Original file line number	Diff line number	Diff line change
`@@ -279,7 +279,7 @@ try {`
`279`	`279`	`}`
`280`	`280`	```
`281`	`281`
`282`		`-Here the narrowing was done with a [typeof](https://www.typescriptlang.org/docs/handbook/2/narrowing.html#typeof-type-guards) type guard, that is just one of the many ways to narrow a type. We shall see many others later in this part.`
	`282`	`+Here the narrowing was done with the [instanceof](https://www.typescriptlang.org/docs/handbook/2/narrowing.html#instanceof-narrowing) type guard, that is just one of the many ways to narrow a type. We shall see many others later in this part.`
`283`	`283`
`284`	`284`	`### Accessing command line arguments`
`285`	`285`