docs(6205): the remaining services files state the reason, not the instance that taught it

The 1-2 hit tail: access, background, backup, backup_job, canonical_systems,
design_stylesheet, forge_connections, moment_actions, notes, notifications,
placement, planning, platforms, projects, record_batch, recurrence,
report_check, retrieval_review, rule_scope, rule_versions, scheduler,
shape_check, supersession, system_rulings, system_usage, text, trash,
verification, version_pinning.

Also corrected while reading:
- backup.py said restore step 16 fills the System map; step 15 does.
- version_pinning.py pointed at a design doc that is not in the repo.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/scribe/services/forge_connections.py

@@ -1,4 +1,4 @@
-"""User-level forge connection CRUD — the keyring rows get_forges reads (#2778).
+"""User-level forge connection CRUD — the keyring rows get_forges reads.
 
 A connection is a user's read-only credential for one forge host; one row per
 (user, host) keeps host-keyed resolution deterministic with no default-pointer