docs: sync documentation with current API (automated) (#1639)

## Summary

Automated documentation drift fix. 2 findings addressed (1 P1 · 1 P2).

## Changes

- `EXAMPLES.md` — fixed wrong variable `voiceEnrollment` →
`emailEnrollment` in the "Enrolling Email" MFA section (P1:
`ReferenceError` if copy-pasted without the voice section)
- `EXAMPLES.md` — upgraded inline `exchangeToken()` deprecation comment
to a visible Markdown callout (P2: deprecated since v2.14.0 with no
visible notice)

<details>
<summary>Full Drift Report</summary>

| # | Severity | File | Line | Issue |
|---|---|---|---|---|
| 1 | P1 | `EXAMPLES.md` | 1308 | Wrong variable
`voiceEnrollment.oobCode` in Enrolling Email section — should be
`emailEnrollment.oobCode` |
| 2 | P2 | `EXAMPLES.md` | 525 | `exchangeToken()` deprecated in v2.14.0
but no visible callout block |

</details>

---
🤖 Generated with
[syncing-docs](https://github.com/atko-cic/claude-marketplace) skill


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Documentation**
* Added a clear deprecation notice for `exchangeToken()`, with guidance
to use `loginWithCustomTokenExchange()` instead.
* **Bug Fixes**
* Corrected the Email MFA enrollment example so it uses the proper
enrollment data and removes an incorrect line.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: sanchitmehtagit

EXAMPLES.md

@@ -676,6 +676,8 @@ async function performTokenExchange() {
 // Note: exchangeToken() is deprecated - use loginWithCustomTokenExchange() instead
 ```
 
+> ⚠️ **Deprecated** — `exchangeToken()` will be removed in the next major version. Use `loginWithCustomTokenExchange()` instead.
+
 ### Required Auth0 Configuration
 
 1. **Create Token Exchange Profile** in Auth0 Dashboard:
@@ -1456,9 +1458,7 @@ const emailEnrollment = await auth0.mfa.enroll({
   email: 'user@example.com' 
 });
 
-const oobCode = voiceEnrollment.oobCode; // Use this code to complete enrollment verification
-
-// Use this code to complete enrollment verification
+const oobCode = emailEnrollment.oobCode; // Use this code to complete enrollment verification
 ```
 
 #### Enrolling Push Notification