Add bot token unmerge endpoint documentation

Document the new /provisional-accounts/unmerge/bot endpoint that allows unmerging provisional accounts using just the bot token and external_user_id, without requiring an external auth token. This ensures identities can always be removed even if the external auth token is no longer accessible.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: spenhand

docs/discord-social-sdk/development-guides/using-provisional-accounts.mdx

@@ -498,6 +498,28 @@ def unmerge_provisional_account(external_auth_token):
 If you have a server backend, you'll want to use the server-to-server unmerge endpoint rather than the SDK helper method to maintain better security and control over the unmerge process.
 :::
 
+#### Unmerging with Bot Token Endpoint
+
+If you're using the [Bot Token Endpoint](/docs/discord-social-sdk/development-guides/using-provisional-accounts#server-authentication-with-bot-token-endpoint) for authentication, you can unmerge accounts without an external auth token.
+
+```python
+import requests
+
+API_ENDPOINT = 'https://discord.com/api/v10'
+BOT_TOKEN = 'YOUR_BOT_TOKEN'
+
+def unmerge_provisional_account(external_user_id):
+  data = {
+    'external_user_id': external_user_id # identifier used in the /token/bot endpoint
+  }
+  headers = {
+    'Content-Type': 'application/json',
+    'Authorization': f'Bot {BOT_TOKEN}'
+  }
+  r = requests.post('%s/provisional-accounts/unmerge/bot' % API_ENDPOINT, json=data, headers=headers)
+  r.raise_for_status()
+```
+
 ### Unmerging Provisional Accounts for Public Clients
 
 <PublicClient />
@@ -619,4 +641,4 @@ Now that you've set up provisional accounts for your game, you can explore more
 [`Client::GetTokenFromProvisionalMerge`]: https://discord.com/developers/docs/social-sdk/classdiscordpp_1_1Client.html#a41062b7dafa331ddd2320daf1b4b273b
 [`Client::SetTokenExpirationCallback`]: https://discord.com/developers/docs/social-sdk/classdiscordpp_1_1Client.html#aab5bfc76809ea22e79f2f7a067ac4519
 [`Client::UnmergeIntoProvisionalAccount`]: https://discord.com/developers/docs/social-sdk/classdiscordpp_1_1Client.html#a2da21ae8a3015e0e5e42c1a7226b256f
-[`Client::UpdateProvisionalAccountDisplayName`]: https://discord.com/developers/docs/social-sdk/classdiscordpp_1_1Client.html#a7485979ab2d4c533b75f8efd5e50bc60
+[`Client::UpdateProvisionalAccountDisplayName`]: https://discord.com/developers/docs/social-sdk/classdiscordpp_1_1Client.html#a7485979ab2d4c533b75f8efd5e50bc60