[clang] [llvm] [clang] Simplify device kernel attributes (PR #137882)

[Aaron Ballman via cfe-commits]

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@@ -396,9 +396,12 @@ any option of a multiversioned function is undefined.
   }];
 }
 
-def SYCLKernelDocs : Documentation {
+def DeviceKernelDocs : Documentation {
   let Category = DocCatFunction;
+  let Heading = "device_kernel";
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AaronBallman wrote:

We should probably list the other spellings of the attribute to the heading, that helps folks searching for those docs.

https://github.com/llvm/llvm-project/pull/137882