Fixing broken attribute documentation for __attribute__((noescape)); a code block was missing and the existing code block was missing a mandatory newline.

llvm-svn: 316267

clang/include/clang/Basic/AttrDocs.td

@@ -142,6 +142,7 @@ annotated with ``noescape`` do not actuallly escape.
 For example:
 
 .. code-block:: c
+
   int *gp;
 
   void nonescapingFunc(__attribute__((noescape)) int *p) {
@@ -156,6 +157,8 @@ Additionally, when the parameter is a `block pointer
 <https://clang.llvm.org/docs/BlockLanguageSpec.html>`, the same restriction
 applies to copies of the block. For example:
 
+.. code-block:: c
+
   typedef void (^BlockTy)();
   BlockTy g0, g1;