* Bump API patch number and header version number to 38 for this update.
Github Issues:
* Make ename:VK_PIPELINE_STAGE_HOST_BIT invalid for all stage masks,
except for flink:vkCmdWaitEvents (public issue 261).
Internal Issues:
* Added validation language for flink:vkQueueBindSparse,
slink:VkPresentInfoKHR, and slink:VkSubmitInfo, and a note to the
<<synchronization-semaphores-waiting,Semaphore Waiting and Unsignaling>>
section to clarify that semaphores must be signaled and waited on in a
1:1 fashion (internal issue 546).
* Modify valid usage for slink:VkBufferImageCopy to only require
pname:bufferOffset to be a multiple of the image format's element size
when the format is not depth/stencil (internal issue 594).
Other Issues:
* Vulkan(R) is now a registered trademark symbol, and this is reflected in
documents and copyright statements.
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