[libc++] Fix malformed CSV entry for C++26 LWG issue

Author: ldionne

libcxx/docs/Status/Cxx2cIssues.csv

@@ -78,5 +78,5 @@
 "","","","","",""
 "`LWG3343 <https://wg21.link/LWG3343>`__","Ordering of calls to ``unlock()`` and ``notify_all()`` in Effects element of ``notify_all_at_thread_exit()`` should be reversed","Not Adopted Yet","|Complete|","16",""
 "`LWG4139 <https://wg21.link/LWG4139>`__","§[time.zone.leap] recursive constraint in <=>","Not Adopted Yet","|Complete|","20",""
-"`LWG3456 <https://wg21.link/LWG3456>`__","Pattern used by std::from_chars is underspecified (option B)",,"Not Yet Adopted","|Complete|","20",""
+"`LWG3456 <https://wg21.link/LWG3456>`__","Pattern used by std::from_chars is underspecified (option B)","Not Adopted Yet","|Complete|","20",""
 "","","","","",""