feat: update getting-started CreateTodo mutationResolver (#2810)

docs/content/getting-started.md

@@ -139,10 +139,10 @@ Returning to `graph/schema.resolvers.go`, let's implement the bodies of those au
 
 ```go
 func (r *mutationResolver) CreateTodo(ctx context.Context, input model.NewTodo) (*model.Todo, error) {
-	rand, _ := rand.Int(rand.Reader, big.NewInt(100))
+	randNumber, _ := rand.Int(rand.Reader, big.NewInt(100))
 	todo := &model.Todo{
 		Text: input.Text,
-		ID:   fmt.Sprintf("T%d", rand),
+		ID:   fmt.Sprintf("T%d", randNumber),
 		User: &model.User{ID: input.UserID, Name: "user " + input.UserID},
 	}
 	r.todos = append(r.todos, todo)
@@ -250,10 +250,10 @@ And run `go run github.com/99designs/gqlgen generate`.
 Now if we look in `graph/schema.resolvers.go` we can see a new resolver, lets implement it and fix `CreateTodo`.
 ```go
 func (r *mutationResolver) CreateTodo(ctx context.Context, input model.NewTodo) (*model.Todo, error) {
+	randNumber, _ := rand.Int(rand.Reader, big.NewInt(100))
 	todo := &model.Todo{
 		Text:   input.Text,
-		ID:     fmt.Sprintf("T%d", rand.Int()),
-		User:   &model.User{ID: input.UserID, Name: "user " + input.UserID},
+		ID:     fmt.Sprintf("T%d", randNumber),
 		UserID: input.UserID,
 	}
 	r.todos = append(r.todos, todo)