removes unused import and updates heading (#8067)

Author: ykethan

src/pages/[platform]/build-a-backend/functions/grant-access-to-other-resources/index.mdx

@@ -119,7 +119,6 @@ However some constructs provide a `grant*` method to grant access to common poli
 
 ```ts title="amplify/backend.ts"
 import { defineBackend } from "@aws-amplify/backend"
-import * as iam from "aws-cdk-lib/aws-iam"
 import * as sns from "aws-cdk-lib/aws-sns"
 import { weeklyDigest } from "./functions/weekly-digest/resource"
 

src/pages/[platform]/build-ui/figma-to-code/index.mdx

@@ -39,7 +39,7 @@ This file contains the following pages:
 
 Please follow the README in our Figma file to learn how to create your components to optimize for code quality.
 
-## Step 2: Run the Amplify UI Builder Figma plugin in dev mode
+## Step 2: Run the Amplify UI Builder Figma plugin
 
 After you duplicate the Figma file, you run the Amplify UI Builder figma plugin in dev mode or non-dev mode to generate Amplify UI React code.