[clang] [Clang][OpenMP]Default clause variable category (PR #157063)

[via cfe-commits]

SunilKuravinakop wrote:

> Update OpenMPSupport.rst and clang release notes

OpenMPSupport.rst has entry:
| variable-category on default clause                         | :part:`In Progress`       | :none:`unclaimed`         |                                                                          |
This was done for me by my colleague, Ritanya Bharadwaj.

Clang release Notes updation done.

https://github.com/llvm/llvm-project/pull/157063