Fix example in email based registration endpoint
The spec says `send_attempt` should be a number, but the example shows it as a string.
@@ -215,7 +215,7 @@ paths:
send_attempt:
type: number
description: Used to distinguish protocol level retries from requests to re-send the email.
- example: "1"
+ example: 1
required: ["client_secret", "email", "send_attempt"]
responses:
200:
