setLinkedCursor() docs pin behavior to v1.2

[mortonanalytics]

R/setLinkedCursor.R:12 (propagated to man/setLinkedCursor.Rd:16) reads:

Only "x" is active in v1.2; other ...

That pins documented behaviour to a version two releases back. Needs a check of whether "y" and "xy" are still inert:

• If still inert, describe the limitation without naming a version.
• If now functional, the doc is wrong twice and the sentence should go.

Roxygen-only change; regenerate man/ with devtools::document().

Deferred from PR #102. Source: 2026-08-01 idea-scout run (C3).

[mortonanalytics]

Fixed on main and released in 1.4.0 (b0a2304). R CMD check --as-cran: Status OK.