[OpenMP] Update 6.1 implementation status. (#161449)

@jhuber6: Please review

Author: CatherineMoore

clang/docs/OpenMPSupport.rst

@@ -580,9 +580,12 @@ implementation.
 | need_device_addr modifier for adjust_args clause            | :part:`partial`           | :none:`unclaimed`         | Parsing/Sema: https://github.com/llvm/llvm-project/pull/143442           |
 |                                                             |                           |                           |               https://github.com/llvm/llvm-project/pull/149586           |
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
-| Prescriptive num_threads                                    | :part:`In Progress`       | :none:`unclaimed`         | ro-i                                                                     |
+| Prescriptive num_threads                                    | :good:`done`              | :none:`unclaimed`         |  https://github.com/llvm/llvm-project/pull/160659                        |
+|                                                             |                           |                           |  https://github.com/llvm/llvm-project/pull/146403                        |
+|                                                             |                           |                           |  https://github.com/llvm/llvm-project/pull/146404                        |
+|                                                             |                           |                           |  https://github.com/llvm/llvm-project/pull/146405                        |
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
-| Message and severity clauses                                | :part:`In Progress`       | :none:`unclaimed`         | ro-i                                                                     |
+| Message and severity clauses                                | :good:`done`              | :none:`unclaimed`         |  https://github.com/llvm/llvm-project/pull/146093                        |
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
 | Local clause on declare target                              | :part:`In Progress`       | :none:`unclaimed`         |                                                                          |
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+