[docs] Fix C'n'P error in QTRY_VERIFY2 example

It's not the _WITH_TIMEOUT variant (the timeout is missing).

Amends a change preceding b24bb12f6a,
the commit that moved all the documentation into qtestcase.qdoc in the
first place. I didn't track the change back further than that.

Pick-to: 6.7 6.6 6.5 6.2 5.15
Change-Id: I79ccd84a5dbed20012fa1a2d3561945f8a7638d5
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

src/testlib/qtestcase.qdoc

@@ -413,7 +413,7 @@
 
    Example:
    \code
-   QTRY_VERIFY2_WITH_TIMEOUT(list.size() > 2, QByteArray::number(list.size()).constData());
+   QTRY_VERIFY2(list.size() > 2, QByteArray::number(list.size()).constData());
    \endcode
 
    \note This macro can only be used in a test function that is invoked