Remove doc for non-existent QTest::qCompare() variant.

There's no variant with bool first argument.

Change-Id: Ib18b50ed6271d21253d075dc72b6e2b8744cf131
Reviewed-by: Topi Reiniö <topi.reinio@theqtcompany.com>

src/testlib/qtestcase.cpp

@@ -3682,10 +3682,6 @@ bool QTest::compare_string_helper(const char *t1, const char *t2, const char *ac
     \internal
 */
 
-/*! \fn bool QTest::qCompare(bool const &t1, int const &t2, const char *actual, const char *expected, const char *file, int line)
-  \internal
- */
-
 /*! \fn bool QTest::qTest(const T& actual, const char *elementName, const char *actualStr, const char *expected, const char *file, int line)
     \internal
 */