[llvm] [AMDGPU][Doc] GFX12.5 Barrier Execution Model (PR #185632)

[Pierre van Houtryve via llvm-commits]

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@@ -6897,50 +6949,23 @@ Barrier operations have the following additional target-specific properties:
 All barrier *objects* have the following additional target-specific properties:
 
 * Barrier *join* does not increment the *expected count* of a barrier *object*. The *expected count* is set
-  during initialization of the barrier by the hardware. :sup:`WIP`
+  during initialization of the barrier by the hardware.
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Pierre-vh wrote:

I just removed the sentence. It was from before, when "drop" was "leave", and this sentence tried to clarify that join and leave are not opposite
The new name is clearer and this sentence is not really useful anymore IMO

https://github.com/llvm/llvm-project/pull/185632