Update email to emailAddress on create-customer-event.mdx (#30)

It appears from the schema https://core-api.uk.plain.com/graphql/v1/schema.graphql that emailAddress is the correct format not email

Co-authored-by: Preslav Mihaylov <[email protected]>

Author: darkopia

_snippets/typescript-sdk/create-customer-event.mdx

@@ -11,7 +11,7 @@ const res = await client.createCustomerEvent({
 
   customerIdentifier: {
     // You can use the email:
-    email: '[email protected]',
+    emailAddress: '[email protected]',
 
     // ...or if you set external id on customers:
     // externalId: 'YOUR_ID',