Doc: Ensure that read-only QML properties are marked correctly


The \nativetype commands were commented out in the documentation for QML
types causing property information to be unavailable to QDoc. With the
commands in place read-only properties are shown correctly.

This change does not reintroduce warnings about the use of private
classes to implement QML types.

Task-number: QTBUG-151698
Change-Id: Ifb190e2dcfdf601c0949f6fe8589b13810826c4e
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
commitf6a9f018962c9a52eb32136f01a4c31150fa3c9e
parentfc240ca62102dd2b61c947e5870c12543b9c16ec
authorDavid Boddie <david.boddie@qt.io>
committerDavid Boddie <david.boddie@qt.io>
commit timeWed, 21 Oct 2026 13:14:33 +0000