Request for documentation

From pull request qgis/QGIS#57990
Author: @nyalldawson
QGIS version: 3.40

Add option to set GeoPDF group name for items

PR Description:

This new setting, located in the layout item "Rendering" section, allows users to set an optional "group name" for use in GeoPDF
exports. When set, a matching layer tree group will be created in the exported GeoPDF and the item will only be visible when
this group is checked.

This allows content to be selectively displayed as a group by viewers of the GeoPDF. Eg, it can allow extra layout content
such as descriptive labels or legends to only be shown when layers from the group are visible, making GeoPDF export much
more flexible.

Sponsored by Rubicon Concierge Real Estate Services

Commits tagged with [need-docs] or [FEATURE]

"[feature][layouts] Add option to set geopdf group name for items\n\nThis new setting, located in the layout item "Rendering" section,\nallows users to set an optional "group name" for use in GeoPDF\nexports. When set, a matching layer tree group will be created\nin the exported GeoPDF and the item will only be visible when\nthis group is checked.\n\nThis allows content to be selectively displayed as a group by\nviewers of the GeoPDF. Eg, it can allow extra layout content\nsuch as descriptive labels or legends to only be shown when\nlayers from the group are visible, making GeoPDF export much\nmore flexible."