Update controllers.md (type 'params' as 'any')

Without specifying the variable 'params' as type 'any' I received the following error on a fresh project while following the documentation:

```typescript
findOne(@param() params): string {
```

```
error TS7006: Parameter 'params' implicitly has an 'any' type.
```

Author: kitchentiger

content/controllers.md

@@ -273,7 +273,7 @@ Routes with static paths won't work when you need to accept **dynamic data** as
 ```typescript
 @@filename()
 @Get(':id')
-findOne(@Param() params): string {
+findOne(@Param() params: any): string {
   console.log(params.id);
   return `This action returns a #${params.id} cat`;
 }