Update getting-started.md (#2140)

* Update getting-started.md

function rand.Int requires two parameters and returns two value in golang version 1.18.1.

* Highlight the package used so people don't pick crypto/rand

* Revert to original

* Remove extra space

Co-authored-by: Steve Coffman <[email protected]>

docs/content/getting-started.md

@@ -135,7 +135,7 @@ type Resolver struct{
 }
 ```
 
-Returning to `graph/schema.resolvers.go`, let's implement the bodies of those automatically generated resolver functions. For `CreateTodo`, we'll use `math.rand` to simply return a todo with a randomly generated ID and store that in the in-memory todos list --- in a real app, you're likely to use a database or some other backend service.
+Returning to `graph/schema.resolvers.go`, let's implement the bodies of those automatically generated resolver functions. For `CreateTodo`, we'll use the [`math.rand` package](https://pkg.go.dev/math/rand#Rand.Int) to simply return a todo with a randomly generated ID and store that in the in-memory todos list --- in a real app, you're likely to use a database or some other backend service.
 
 ```go
 func (r *mutationResolver) CreateTodo(ctx context.Context, input model.NewTodo) (*model.Todo, error) {