[NFC][SYCL] Remove doc for buffer_location attribute (#2273)

Speling-less attributes can't have a documentation. That is
unfortunate.

Signed-off-by: Dmitry Sidorov <[email protected]>

Author: MrSidims

clang/include/clang/Basic/Attr.td

@@ -1193,7 +1193,7 @@ def SYCLIntelBufferLocation : InheritableAttr {
   let Spellings = [];
   let Args = [UnsignedArgument<"LocationID">];
   let LangOpts = [SYCLIsDevice, SYCLIsHost];
-  let Documentation = [SYCLIntelBufferLocationAttrDocs];
+  let Documentation = [Undocumented];
 }
 
 def SYCLIntelKernelArgsRestrict : InheritableAttr {

clang/include/clang/Basic/AttrDocs.td

@@ -1994,25 +1994,6 @@ can be lowered.
   }];
 }
 
-def SYCLIntelBufferLocationAttrDocs : Documentation {
-  let Category = DocCatFunction;
-  let Heading = "kernel_args_buffer_location";
-  let Content = [{
-This attribute is implicitly added to OpenCL pointer kernel parameters generated
-from a SYCL kernel object. It lacks a spelling, as it is not intended to be used
-by the programmer.
-
-This attribute causes clang to generate metadata on the OpenCL kernel containing
-the number of kernel parameters. The metadata contains an integer that is set
-according to the values passed through the ``accessor`` property
-``buffer_location``. These values are mapped to the actual locations of the
-global buffers (such as DDR, QDR, etc) and applied to pointer kernel parameters.
-Number of metadata arguments is the same as a number of kernel parameters, so
-any parameter that isn't an ``accessor`` with ``buffer_location`` property is
-annotated by '-1' in the metadata node.
-  }];
-}
-
 def SYCLIntelKernelArgsRestrictDocs : Documentation {
   let Category = DocCatVariable;
   let Heading = "kernel_args_restrict";