Add guide for bulk delete external users (#801)

* Add guide for bulk del ext users

* Lint issue

Author: superojla

content/guides/users/bulk-delete-external-users.md

@@ -0,0 +1,29 @@
+---
+rank: 7
+related_endpoints:
+  - post_external_users_submit_delete_job
+related_guides:
+  - users/delete-user
+  - users/deprovision
+related_pages: []
+required_guides: []
+related_resources: []
+alias_paths: []
+---
+
+# Bulk delete external users
+
+You can remove up to 100 external users from your enterprise using API. 
+This API endpoint removes access to all types of content you invited the
+listed external users to collaborate on.
+
+To remove the external users, call the
+[`POST /external_users/post_external_users_submit_delete_job`]. 
+
+<Samples id="post_external_users_submit_delete_job" />
+
+This job runs in the background, and sends a completion report listing deletion status for each user when it's finished.
+
+<Message type='notice'>
+When you delete external users, their pending collaboration invites are not deleted. 
+</Message>