Update routing-params.md (#8548)

remove redundant word

docs/docs/tutorial/chapter2/routing-params.md

@@ -188,7 +188,7 @@ Cool, cool, cool. Now we need to construct a link that has the ID of a post in i
 
 When you have your dev server running, the Redwood CLI will watch your project and generate types. You can regenerate these types manually too, by running `yarn rw g types`.
 
-In this case, the path `/article/{id}` doesn't specify the type of `id` - so it defaults to `string` - where as our article id is actually a `number`. We'll tackle this in in the next few sections - so you can ignore the red squiggle for now, and power through!
+In this case, the path `/article/{id}` doesn't specify the type of `id` - so it defaults to `string` - where as our article id is actually a `number`. We'll tackle this in the next few sections - so you can ignore the red squiggle for now, and power through!
 :::
 
 </ShowForTs>