Doc: corrected minor link issues

qcore_foundation.mm:
- Can't link to 'fromCGPoint()'
- Undocumented parameter 'point' in QPointF::fromCGPoint()
- Can't link to 'fromCGRect()'
- Undocumented parameter 'rect' in QRectF::fromCGRect()
- Can't link to 'fromCGSize()'
- Undocumented parameter 'size' in QSizeF::fromCGSize()

Change-Id: Ie48f04c7b990634f8c5a836100b1be7854848bb4
Reviewed-by: Venugopal Shivashankar <Venugopal.Shivashankar@qt.io>

src/corelib/kernel/qcore_foundation.mm

@@ -427,7 +427,7 @@ NSDate *QDateTime::toNSDate() const
 
     Creates a CGRect from a QRect.
 
-    \sa fromCGRect()
+    \sa QRectF::fromCGRect()
 */
 CGRect QRect::toCGRect() const Q_DECL_NOTHROW
 {
@@ -449,7 +449,7 @@ CGRect QRectF::toCGRect() const Q_DECL_NOTHROW
 /*!
     \since 5.8
 
-    Creates a QRectF from a CGRect.
+    Creates a QRectF from CGRect \a rect.
 
     \sa toCGRect()
 */
@@ -465,7 +465,7 @@ QRectF QRectF::fromCGRect(CGRect rect) Q_DECL_NOTHROW
 
     Creates a CGPoint from a QPoint.
 
-    \sa fromCGPoint()
+    \sa QPointF::fromCGPoint()
 */
 CGPoint QPoint::toCGPoint() const Q_DECL_NOTHROW
 {
@@ -487,7 +487,7 @@ CGPoint QPointF::toCGPoint() const Q_DECL_NOTHROW
 /*!
     \since 5.8
 
-    Creates a QRectF from a CGPoint.
+    Creates a QRectF from CGPoint \a point.
 
     \sa toCGPoint()
 */
@@ -503,7 +503,7 @@ QPointF QPointF::fromCGPoint(CGPoint point) Q_DECL_NOTHROW
 
     Creates a CGSize from a QSize.
 
-    \sa fromCGSize()
+    \sa QSizeF::fromCGSize()
 */
 CGSize QSize::toCGSize() const Q_DECL_NOTHROW
 {
@@ -525,7 +525,7 @@ CGSize QSizeF::toCGSize() const Q_DECL_NOTHROW
 /*!
     \since 5.8
 
-    Creates a QRectF from a CGSize.
+    Creates a QRectF from \a size.
 
     \sa toCGSize()
 */

src/corelib/thread/qmutex.cpp

@@ -268,6 +268,9 @@ bool QMutex::tryLock(int timeout) QT_MUTEX_LOCK_NOEXCEPT
 
     This function is provided for compatibility with the Standard Library
     concept \c Lockable. It is equivalent to tryLock().
+
+    The function returns \c true if the lock was obtained; otherwise it
+    returns \c false
 */
 
 /*! \fn bool QMutex::try_lock_for(std::chrono::duration<Rep, Period> duration)