qcocoa: Fix typos in documentation

Pick-to: 5.15 6.2
Change-Id: Ibf86b9b95715e20e8bf9c49a347f9c8ca0c04bb5
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

src/plugins/platforms/cocoa/qcocoahelpers.mm

@@ -157,7 +157,7 @@ Qt::DropActions qt_mac_mapNSDragOperations(NSDragOperation nsActions)
     that the platform window is not a foreign window before using
     this cast, via QPlatformWindow::isForeignWindow().
 
-    Do not use this method soley to check for foreign windows, as
+    Do not use this method solely to check for foreign windows, as
     that will make the code harder to read for people not working
     primarily on macOS, who do not know the difference between the
     NSView and QNSView cases.

src/plugins/platforms/cocoa/qcocoascreen.mm

@@ -552,7 +552,7 @@ QWindow *QCocoaScreen::topLevelAt(const QPoint &point) const
     \internal
 
     Coordinates are in screen coordinates if \a view is 0, otherwise they are in view
-    coordiantes.
+    coordinates.
 */
 QPixmap QCocoaScreen::grabWindow(WId view, int x, int y, int width, int height) const
 {