Update lib/msal-react/docs/migration-guide.md
Update lib/msal-react/docs/migration-guide.md

Co-authored-by: Prithvi Kanherkar <6252d0c99c65153689f540e8e4b6d0b317bab09a@microsoft.com>
AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js,AzureAD/microsoft-authentication-library-for-js