fixup: update documentation

Reflect that pointer+pointer is also possible now.

Author: a-nogikh

clang/docs/ReleaseNotes.rst

@@ -329,7 +329,7 @@ Attribute Changes in Clang
 
 - New function attribute `malloc_span` is added. It has semantics similar to that of the `malloc`
   attribute, but `malloc_span` applies not to functions returning pointers, but to functions returning
-  span-like structures (i.e. those that contain a pointer field and a size integer field).
+  span-like structures (i.e. those that contain a pointer field and a size integer field or two pointers).
 
 Improvements to Clang's diagnostics
 -----------------------------------

clang/include/clang/Basic/AttrDocs.td

@@ -5257,8 +5257,9 @@ where the returned memory range does not alias storage from any other object
 accessible to the caller.
 
 In this context, a span-like structure is assumed to have two fields, one of
-which is a pointer to the allocated memory and another one is an integer type
-containing the size of the actually allocated memory.
+which is a pointer to the start of theallocated memory and another one is
+either an integer type containing the size of the actually allocated memory
+or a pointer the end of the allocated region.
   }];
 }