QDoc: Update description of test case


The test case referred to a specific bug, but it exercises behavior
related to several other issues. Make the description more general and
update the impacted test data.

Pick-to: 6.12
Task-number: QTBUG-151108
Change-Id: If22c3799451fb1d34cf20ba13a4953016282445b
Reviewed-by: David Boddie <david.boddie@qt.io>
commite3bcc7a924dae41cc2d824551e9d9eb5f24f3741
parent57ec713f38662580535b08bfcf0b106f474e250d
authorPaul Wicking <paul.wicking@qt.io>
committerPaul Wicking <paul.wicking@qt.io>
commit timeMon, 5 Oct 2026 16:50:33 +0000