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arturovt a7b9ff5a58 docs: document FormBuilder.group() controlsConfig value shapes
The `@param` JSDoc for `FormBuilder.group()` previously described the argument only as “a collection of child controls”, without explaining the four supported value shapes:

* a raw value
* a `FormControlState`
* a `ControlConfig` tuple
* a pre-built `AbstractControl`

The fact that the second element of a `ControlConfig` tuple can accept `AbstractControlOptions` (for example to configure per-control `updateOn`) was especially non-obvious and undocumented.

This change adds a `@usageNotes` section with concrete examples covering each supported shape.

Closes #43984

(cherry picked from commit 3b8503f960)
2026-05-20 14:07:59 -07:00
..
2025-11-06 10:03:05 -08:00