[docs][OpenMP] Update the status of GROUPPRIVATE in flang (#157470)

Author: kparzysz

clang/docs/OpenMPSupport.rst

@@ -477,7 +477,10 @@ implementation.
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
 | Local clause on declare target                              | :part:`In Progress`       | :none:`unclaimed`         |                                                                          |
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
-| groupprivate directive                                      | :part:`In Progress`       | :part:`In Progress`       | Flang: kparzysz, mjklemm                                                 |
+| groupprivate directive                                      | :part:`In Progress`       | :part:`partial`           | Flang: kparzysz, mjklemm                                                 |
+|                                                             |                           |                           |                                                                          |
+|                                                             |                           |                           | Flang parser: https://github.com/llvm/llvm-project/pull/153807           |
+|                                                             |                           |                           | Flang sema: https://github.com/llvm/llvm-project/pull/154779             |
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
 | variable-category on default clause                         | :part:`In Progress`       | :none:`unclaimed`         |                                                                          |
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+