[OpenMP] Updates support documentation file

Claims omp_target_is_accessible as in progress.
Adds entry for 6.0 changes (spec requires minor clarification) and claims them as in progress for C/C++.

Author: nicebert

clang/docs/OpenMPSupport.rst

@@ -256,7 +256,7 @@ implementation.
 +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
 | device                       | device-specific environment variables                        | :none:`unclaimed`        |                                                                       |
 +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
-| device                       | omp_target_is_accessible routine                             | :none:`unclaimed`        |                                                                       |
+| device                       | omp_target_is_accessible routine                             | :part:`In Progress`      | https://github.com/llvm/llvm-project/pull/138294                      |
 +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
 | device                       | omp_get_mapped_ptr routine                                   | :good:`done`             | D141545                                                               |
 +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
@@ -449,7 +449,7 @@ implementation.
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
 | Clarifications to Fortran map semantics                     | :none:`unclaimed`         | :none:`unclaimed`         |                                                                          |
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
-| default clause at target construct                          | :part:`In Progress`         | :none:`unclaimed`         |                                                                        |
+| default clause at target construct                          | :part:`In Progress`       | :none:`unclaimed`         |                                                                          |
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
 | ref count update use_device_{ptr, addr}                     | :none:`unclaimed`         | :none:`unclaimed`         |                                                                          |
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
@@ -476,6 +476,8 @@ implementation.
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
 | Local clause on declare target                              | :part:`In Progress`       | :none:`unclaimed`         |                                                                          |
 +-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
+| Changes to omp_target_is_accessible                         | :part:`In Progress`       | :part:`In Progress`       |                                                                          |
++-------------------------------------------------------------+---------------------------+---------------------------+--------------------------------------------------------------------------+
 
 OpenMP Extensions
 =================