vulkan/wsi/x11: document implementation
When working on #3344 (closed) I realized that I had to write down some notes to understand the high-level design of the implementation. I did this in code directly and I think merging these notes can help other contributors to get started.
Adds mostly high-level documentation for some central functions at the start of the function and some in-body documentation about the function flow. Also improves some existing documentation.
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Complete documentation for additional wait fence in mailbox mode, introduced by 5eae9bfb.