docs: add Docebo SSO configuration and category ID guidance

[mstrivens]

What

Adds two things to the Docebo connection guide (connection-guides/lms/docebo.mdx):

1. SSO Configuration section — how to set the standard SSO field lms_user_id to the Docebo user_id so completions are attributed to the correct learner.
2. Find Category ID step — use the List Categories request to get a category's StackOne ID before passing it on content upsert.

Why

Completion tracking needs the Docebo user_id to reach the completion request. Since the SSO handshake is between Docebo and the content provider (StackOne isn't in it), the T2 exposes it via lms_user_id and the content provider passes it on. lms_user_id is the standard field name across LMS connectors. Mirrors the SAP SuccessFactors guide.

The docs.stackone.com counterpart is StackOneHQ/docs#1015.

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[Copilot]

Pull request overview

This PR updates the Docebo LMS connection guide to help integrators (a) attribute completions to the correct learner via SSO, and (b) locate the correct category identifier before assigning content to a category.

Changes:

• Adds an optional step explaining how to find a category’s StackOne ID via the “List Categories” request.
• Adds an “SSO Configuration” section describing how to expose Docebo user_id via the standard lms_user_id SSO field for completion attribution.

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Project	Status	Preview	Updated (UTC)
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