[OPENMP] Fixed documentation category for 'declare simd' attribute, NFC.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@265127 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/AttrDocs.td

@@ -1900,7 +1900,7 @@ arguments, with arbitrary offsets.
 }
 
 def OMPDeclareSimdDocs : Documentation {
-  let Category = DocCatStmt;
+  let Category = DocCatFunction;
   let Heading = "#pragma omp declare simd";
   let Content = [{
 The `declare simd` construct can be applied to a function to enable the creation