Issue #3590981 by joshuami: Default editor_instructions help link should open in a new tab.

Joshua Mitchellrequested to merge
issue/pdfa11y-3590981:3590981-default-editorinstructions-help into 1.0.x

Add target="_blank" to the anchor in the default editor_instructions config value so fresh installs render the "PDF Accessibility Help" link as a new-tab link. Editors who click the help link from inside the CKEditor "Add or select media" modal no longer lose their upload context to an in-tab navigation.

Existing sites with a customized editor_instructions value are left untouched; release notes will direct operators to add target="_blank" themselves if they want the new-tab behavior.

Co-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com

Closes #3590981

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