Setting a heading for the section/allocate attribute so that the attribute...

Setting a heading for the section/allocate attribute so that the attribute documentation can be properly generated.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209890 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/AttrDocs.td

@@ -33,6 +33,7 @@ def SectionDocs : Documentation {
 The ``section`` attribute allows you to specify a specific section a
 global variable or function should be in after translation.
   }];
+  let Heading = "section (gnu::section, __declspec(allocate))";
 }
 
 def TLSModelDocs : Documentation {