docs(cognito): Correct incorrect attribute names in the docs (aws#12969)

Minor: Set correct field names for doc-blocks.

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk/aws-cognito/lib/user-pool-idps/base.ts

@@ -38,17 +38,17 @@ export class ProviderAttribute {
   public static readonly GOOGLE_GENDER = new ProviderAttribute('gender');
   /** The birthday attribute provided by Google */
   public static readonly GOOGLE_BIRTHDAYS = new ProviderAttribute('birthdays');
-  /** The birthday attribute provided by Google */
+  /** The phone number attribute provided by Google */
   public static readonly GOOGLE_PHONE_NUMBERS = new ProviderAttribute('phoneNumbers');
   /** The email attribute provided by Google */
   public static readonly GOOGLE_EMAIL = new ProviderAttribute('email');
   /** The name attribute provided by Google */
   public static readonly GOOGLE_NAME = new ProviderAttribute('name');
-  /** The email attribute provided by Google */
+  /** The picture attribute provided by Google */
   public static readonly GOOGLE_PICTURE = new ProviderAttribute('picture');
-  /** The email attribute provided by Google */
+  /** The given name attribute provided by Google */
   public static readonly GOOGLE_GIVEN_NAME = new ProviderAttribute('given_name');
-  /** The email attribute provided by Google */
+  /** The family name attribute provided by Google */
   public static readonly GOOGLE_FAMILY_NAME = new ProviderAttribute('family_name');
 
   /**
@@ -195,4 +195,4 @@ export interface UserPoolIdentityProviderProps {
    * @default - no attribute mapping
    */
   readonly attributeMapping?: AttributeMapping;
-}
+}