Add optional name to Hetero-C++ marker signatures in specification

hpvm/docs/developerdocs/specifications/hetero-c.rst

@@ -68,7 +68,7 @@ opaque handle in the first argument.
 Parallel Task API
 -----------------
 
-``void* __hetero_task_begin(unsigned ni ,..., unsigned no, ...)``
+``void* __hetero_task_begin(unsigned ni ,..., unsigned no, ..., ["name"])``
 
 Defines the starting point for a Parallel Task with the input and output
 buffer pairs specified. Returns an opaque handle to the starting point
@@ -95,7 +95,7 @@ in the first argument.
 Parallel Loop API
 -----------------
 
-``void __hetero_parallel_loop(unsigned num_loops ,unsigned ni ,..., unsigned no, ...)``
+``void __hetero_parallel_loop(unsigned num_loops ,unsigned ni ,..., unsigned no, ..., ["name"])``
 
 Specifies that a loop can be parallelized by creating a N-Dimensional
 Node in the hetero DFG. The first argument ``num_loops`` specifies the