Make the dialog example work out of the box on all 3 platforms

Editor assessment

The subject states the goal and its scope completely: the dialog example now works out of the box on all three platforms. The artifact, the defect class (platform-specific breakage in an example), and the ambition (universal function) are all present, so no body is required. The docs type fits example fixes, no scope is needed, and no footers appear. Hygiene is clean, with the informal all 3 platforms remaining unambiguous. The message tells readers exactly what improved and for whom, which is complete communication for an example repair.