Compute shader chapter documentation not properly updated to timeline semaphores

[SaschaWillems]

The compute shader chapter code been updated to use Timeline semaphores. The documentation though hasn't been properly updated and still uses separate fences, e.g.:

We then use these to synchronize the compute buffer submission with the graphics submission:

[,c++]
----
{
    // Compute submission
    while ( vk::Result::eTimeout == device->waitForFences(**computeInFlightFences[frameIndex], vk::True, UINT64_MAX) )
        ;

    updateUniformBuffer(frameIndex);
    device->resetFences( **computeInFlightFences[frameIndex] );
    computeCommandBuffers[frameIndex]->reset();
    recordComputeCommandBuffer();

    const vk::SubmitInfo submitInfo({}, {}, {**computeCommandBuffers[frameIndex]}, { **computeFinishedSemaphores[frameIndex]});
    computeQueue->submit(submitInfo, **computeInFlightFences[frameIndex]);
}
{
    // Graphics submission
    while ( vk::Result::eTimeout == device->waitForFences(**inFlightFences[frameIndex], vk::True, UINT64_MAX))
...

    device->resetFences(  **inFlightFences[frameIndex] );
    commandBuffers[frameIndex]->reset();
    recordCommandBuffer(imageIndex);

    vk::Semaphore waitSemaphores[] = {**presentCompleteSemaphore[frameIndex], **computeFinishedSemaphores[frameIndex]};
    vk::PipelineStageFlags waitDestinationStageMask[] = { vk::PipelineStageFlagBits::eVertexInput, vk::PipelineStageFlagBits::eColorAttachmentOutput };
    const vk::SubmitInfo submitInfo( waitSemaphores, waitDestinationStageMask, {**commandBuffers[frameIndex]}, {**renderFinishedSemaphore[frameIndex]} );
    graphicsQueue->submit(submitInfo, **inFlightFences[frameIndex]);
----

[LordKobra]

Also i think the waitDestinationStageMask[] entries need to be flipped.
Currently:

vk::Semaphore waitSemaphores[] = {**presentCompleteSemaphore[frameIndex], **computeFinishedSemaphores[frameIndex]};
    vk::PipelineStageFlags waitDestinationStageMask[] = { vk::PipelineStageFlagBits::eVertexInput, vk::PipelineStageFlagBits::eColorAttachmentOutput };

The documentation of VkSubmitInfo states:

pWaitDstStageMask is a pointer to an array of pipeline stages at which each corresponding semaphore wait will occur.

So in the current order the vertex input waits on the present semaphore and the color output on the compute semaphore.