[OpenMP][Docs] Update Clang Support docs after D75591

Author: jdoerfert

clang/docs/OpenMPSupport.rst

@@ -264,7 +264,7 @@ want to help with the implementation.
 +==============================+==============================================================+==========================+=======================================================================+
 | misc extension               | user-defined function variants with #ifdef protection        | :part:`worked on`        | D71179                                                                |
 +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
-| misc extension               | default(firstprivate) & default(private)                     | :part:`worked on`        |                                                                       |
+| misc extension               | default(firstprivate) & default(private)                     | :part:`partial`          | firstprivate done: D75591                                             |
 +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+
 | loop extension               | Loop tiling transformation                                   | :part:`claimed`          |                                                                       |
 +------------------------------+--------------------------------------------------------------+--------------------------+-----------------------------------------------------------------------+