[OpenMP][NFC] update status for 5.1 'fail' atomic extension

Update status for the atomic 'fail' clause to "worked on".

Reviewed By: cchen

Differential Revision: https://reviews.llvm.org/D115901

clang/docs/OpenMPSupport.rst

@@ -266,7 +266,7 @@ want to help with the implementation.
 +==============================+==============================================================+==========================+=======================================================================+
 | atomic extension             | 'compare' clause on atomic construct                         | :good:`worked on`        |                                                                       |
 +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
-| atomic extension             | 'fail' clause on atomic construct                            | :none:`unclaimed`        |                                                                       |
+| atomic extension             | 'fail' clause on atomic construct                            | :part:`worked on`        |                                                                       |
 +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
 | base language                | C++ attribute specifier syntax                               | :good:`done`             | D105648                                                               |
 +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+