docs: reconcile the backlog with the user's notes

Two entries in the notes had no item here. Both causes verified in the code
rather than copied from the note.

Item 119, the unsynced-changes count being clickable, is bigger than it reads.
pendingEditCount() sums four sources and one of them, m_unnettablePendingEdits,
is a bare int by design: it counts confirmed changes carrying no message ids, so
a dialog built from what is currently kept can list three groups and then owes
the user a remainder it cannot describe.

Item 120 goes to the deferred table, matching where the user filed it. It is not
plannable as it stands: nothing records which rule tagged a message, so the
information does not exist to display, and creating it means the post-new hook
storing something per message, which is a shared-format change across both
repos.

Everything else in the notes maps to an existing item.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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