Remove stale preview documentation from stabilized rule behaviors

[charliermarsh]

These behaviors were stabilized, so the docs referring to them as preview-only are incorrect.

[github-actions]

ruff-ecosystem results

Linter (stable)

ℹ️ ecosystem check encountered linter errors. (no lint changes; 2 project errors)

demisto/content (error)

warning: The top-level linter settings are deprecated in favour of their counterparts in the `lint` section. Please update the following options in your configuration:
  - 'ignore' -> 'lint.ignore'
  - 'select' -> 'lint.select'
  - 'unfixable' -> 'lint.unfixable'
  - 'per-file-ignores' -> 'lint.per-file-ignores'


ruff failed
  Cause: Rule `PGH002` was removed and cannot be selected.

sphinx-doc/sphinx (error)

warning: The `show-source` option has been deprecated in favor of `output-format`'s "full" and "concise" variants. Please update your configuration to use `output-format = <full|concise>` instead.
warning: `RUF011` has been remapped to `B035`.
warning: `TCH006` has been remapped to `TCH010`.
ruff failed
  Cause: Selection of unstable rules without the `--preview` flag is not allowed. Enable preview or remove selection of:
	- FURB113
	- FURB131
	- FURB132

Linter (preview)

ℹ️ ecosystem check encountered linter errors. (no lint changes; 2 project errors)

demisto/content (error)

ruff check --no-cache --exit-zero --ignore RUF9 --output-format concise --preview

warning: The top-level linter settings are deprecated in favour of their counterparts in the `lint` section. Please update the following options in your configuration:
  - 'ignore' -> 'lint.ignore'
  - 'select' -> 'lint.select'
  - 'unfixable' -> 'lint.unfixable'
  - 'per-file-ignores' -> 'lint.per-file-ignores'


ruff failed
  Cause: Rule `PGH002` was removed and cannot be selected.

sphinx-doc/sphinx (error)

ruff check --no-cache --exit-zero --ignore RUF9 --output-format concise --preview

warning: The `show-source` option has been deprecated in favor of `output-format`'s "full" and "concise" variants. Please update your configuration to use `output-format = <full|concise>` instead.
warning: `RUF011` has been remapped to `B035`.
warning: `TCH006` has been remapped to `TCH010`.
ruff failed
  Cause: Selection of deprecated rule `ANN102` is not allowed when preview is enabled.