Apply fixes for eleven open documentation issues from the source repo

[jasnoyaeger]

Applies the well-specified fixes from open issues on verge-io/docs to the GitBook site. One batch, one file set per issue:

• Docs: User creation -- "Member of Groups" step no longer exists in UI docs#459 — Removed the obsolete Member of Groups step from user creation (field removed in 26.1.x); added a pointer to the Add Members flow (run/product-guide/system/users-groups.md)
• Docs: Fix incorrect 7-day lock claim on Immutable Snapshots page docs#480 — Rewrote the immutable snapshots danger banner and Key Features to match actual behavior: lock = min(retention, 7 days); immutability does not extend retention; aligned related wording through the page (automate/product-guide/backup-dr/immutable-snapshots.md)
• Docs: Clarify task schedule times use cluster/system time docs#479 — Added notes that schedule times are evaluated in cluster/system time, not browser time (automate/product-guide/automation/schedules.md, create-tasks.md)
• Docs: Site Sync notify_start / notify_complete HTTP 500 Error docs#472 — Added the notify_start/notify_complete HTTP 500 (version mismatch) entry to the sync errors KB (knowledge-base/backup-dr/snapshot-synchronization-errors-explained.md)
• Docs: Permissions Page - Callout Required for 'Your System' List Scope docs#466 — Added a callout that resource list views require List on Your System; also updated the full-permissions procedure's Type dropdown label from "Your Cloud" to "Your System" (confirmed current UI label) (run/product-guide/system/permissions.md)
• Docs: Choosing Sync Scope for DR Granularity docs#476 — Added the "Choosing the Right Sync Scope for DR Granularity" section (automate/product-guide/backup-dr/syncs-overview.md)
• Docs: AD-Backed UI Login vs NAS Domain Join — Disambiguation docs#477 — Added UI-login vs NAS-domain-join disambiguation and the no-native-LDAP statement (run/product-guide/auth/auth-sources-general.md)
• Docs: Why vSAN Tier Total Exceeds Per-Drive Usage Sum docs#473 — Added the "Why the Tier Total Exceeds the Sum of Drive Usage" section (knowledge-base/storage-vsan/understanding-and-explaining-unexpected-vsan-growth.md)
• Docs: Document self-signed certificate auto-renewal / expiration behavior docs#470 — Documented self-signed certificate auto-renewal (per engineering confirmation in the issue) (run/product-guide/system/certificates.md)
• Docs: SMART Max Hours Setting — Alert Meaning and Resolution docs#474 — Expanded the SMART max hours row and added an age-warning-vs-failure note (run/product-guide/system/advanced-system-settings.md)
• Docs: Remote log forwarding doc: fix RFC5424 template and expand guidance docs#434 — Bug fixes only: template now uses literal 1 (RFC 5424 version) instead of %PROTOCOL-VERSION%, renamed GRAYLOGRFC5424 to RFC5424, and added a warning about version-0 rejection (knowledge-base/troubleshooting/configuring-remote-log-forwarding.md). The issue's larger content additions (TCP/UDP guidance, multi-cluster hostnames, tested collectors) are not included here.

Reviewer notes — deviations from the issue text

• #476: The issue's table claimed a whole-system sync allows recovery of the "whole system only." That contradicts our published KB (Recovering a Single VM from a Remote System Snapshot), which documents per-VM recovery from a received system snapshot. I reframed the distinction around tenant workloads: tenants replicate as single objects, so per-VM recovery inside a tenant needs tenant-to-tenant sync. Please confirm this framing.
• #474: The 87600-hour (10-year) field cap and its validation error come from support knowledge and were flagged in the issue as not lab-tested.
• #473: Adjusted the issue's menu paths to match the rest of our docs (System > System Snapshots, Backup/DR > Outgoing Syncs; the issue said "System > Cloud Snapshots" and "System > Site Syncs > Outgoing").
• Removed the stale "Document Information" footers from the two KB articles touched, per current convention.

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