[libc++][docs] Add missing column headers for GitHub issues

We started to list GitHub issues in the status CSV tables/pages due to
e0d0b90. However, the changes made
existing column header insufficient. We probably need to add new column
headers for GitHub issues.

Author: frederick-vs-ja

libcxx/docs/Status/Cxx17Issues.csv

@@ -1,4 +1,4 @@
-"Issue #","Issue Name","Meeting","Status","First released version","Notes"
+"Issue #","Issue Name","Meeting","Status","First released version","GitHub issue","Notes"
 "`LWG2016 <https://wg21.link/LWG2016>`__","Allocators must be no-throw swappable","2014-11 (Urbana)","|Complete|","","`#103224 <https://github.com/llvm/llvm-project/issues/103224>`__",""
 "`LWG2118 <https://wg21.link/LWG2118>`__","``unique_ptr``\  for array does not support cv qualification conversion of actual argument","2014-11 (Urbana)","|Complete|","","`#103225 <https://github.com/llvm/llvm-project/issues/103225>`__",""
 "`LWG2170 <https://wg21.link/LWG2170>`__","Aggregates cannot be ``DefaultConstructible``\ ","2014-11 (Urbana)","|Complete|","","`#103226 <https://github.com/llvm/llvm-project/issues/103226>`__",""

libcxx/docs/Status/Cxx17Papers.csv

@@ -1,4 +1,4 @@
-"Paper #","Paper Name","Meeting","Status","First released version","Notes"
+"Paper #","Paper Name","Meeting","Status","First released version","GitHub issue","Notes"
 "`N3911 <https://wg21.link/N3911>`__","TransformationTrait Alias ``void_t``\ .","2014-11 (Urbana)","|Complete|","3.6","`#103603 <https://github.com/llvm/llvm-project/issues/103603>`__",""
 "`N4089 <https://wg21.link/N4089>`__","Safe conversions in ``unique_ptr<T[]>``\ .","2014-11 (Urbana)","|Complete|","5","`#99936 <https://github.com/llvm/llvm-project/issues/99936>`__",""
 "`N4169 <https://wg21.link/N4169>`__","A proposal to add invoke function template","2014-11 (Urbana)","|Complete|","3.7","`#103604 <https://github.com/llvm/llvm-project/issues/103604>`__",""

libcxx/docs/Status/Cxx20Issues.csv

@@ -1,4 +1,4 @@
-"Issue #","Issue Name","Meeting","Status","First released version","Notes"
+"Issue #","Issue Name","Meeting","Status","First released version","GitHub issue","Notes"
 "`LWG2070 <https://wg21.link/LWG2070>`__","``allocate_shared``\  should use ``allocator_traits<A>::construct``\ ","2017-07 (Toronto)","|Nothing To Do|","","`#103733 <https://github.com/llvm/llvm-project/issues/103733>`__","Resolved by `P0674R1 <https://wg21.link/P0674R1>`__"
 "`LWG2444 <https://wg21.link/LWG2444>`__","Inconsistent complexity for ``std::sort_heap``\ ","2017-07 (Toronto)","|Nothing To Do|","","`#103734 <https://github.com/llvm/llvm-project/issues/103734>`__",""
 "`LWG2593 <https://wg21.link/LWG2593>`__","Moved-from state of Allocators","2017-07 (Toronto)","|Nothing To Do|","","`#100220 <https://github.com/llvm/llvm-project/issues/100220>`__",""

libcxx/docs/Status/Cxx20Papers.csv

@@ -1,4 +1,4 @@
-"Paper #","Paper Name","Meeting","Status","First released version","Notes"
+"Paper #","Paper Name","Meeting","Status","First released version","GitHub issue","Notes"
 "`P0463R1 <https://wg21.link/P0463R1>`__","Endian just Endian","2017-07 (Toronto)","|Complete|","7","`#103999 <https://github.com/llvm/llvm-project/issues/103999>`__",""
 "`P0674R1 <https://wg21.link/P0674R1>`__","Extending make_shared to Support Arrays","2017-07 (Toronto)","|Complete|","15","`#104000 <https://github.com/llvm/llvm-project/issues/104000>`__",""
 "","","","","",""

libcxx/docs/Status/Cxx23Issues.csv

@@ -1,4 +1,4 @@
-"Issue #","Issue Name","Meeting","Status","First released version","Notes"
+"Issue #","Issue Name","Meeting","Status","First released version","GitHub issue","Notes"
 "`LWG2839 <https://wg21.link/LWG2839>`__","Self-move-assignment of library types, again","2020-11 (Virtual)","|Nothing To Do|","","`#104255 <https://github.com/llvm/llvm-project/issues/104255>`__",""
 "`LWG3117 <https://wg21.link/LWG3117>`__","Missing ``packaged_task`` deduction guides","2020-11 (Virtual)","|Complete|","16","`#104256 <https://github.com/llvm/llvm-project/issues/104256>`__",""
 "`LWG3143 <https://wg21.link/LWG3143>`__","``monotonic_buffer_resource`` growth policy is unclear","2020-11 (Virtual)","","","`#104258 <https://github.com/llvm/llvm-project/issues/104258>`__",""

libcxx/docs/Status/Cxx23Papers.csv

@@ -1,4 +1,4 @@
-"Paper #","Paper Name","Meeting","Status","First released version","Notes"
+"Paper #","Paper Name","Meeting","Status","First released version","GitHub issue","Notes"
 "`P0881R7 <https://wg21.link/P0881R7>`__","A Proposal to add stacktrace library","2020-11 (Virtual)","","","`#105131 <https://github.com/llvm/llvm-project/issues/105131>`__",""
 "`P0943R6 <https://wg21.link/P0943R6>`__","Support C atomics in C++","2020-11 (Virtual)","|Complete|","15","`#105132 <https://github.com/llvm/llvm-project/issues/105132>`__",""
 "`P1048R1 <https://wg21.link/P1048R1>`__","A proposal for a type trait to detect scoped enumerations","2020-11 (Virtual)","|Complete|","12","`#105134 <https://github.com/llvm/llvm-project/issues/105134>`__",""

libcxx/docs/Status/Cxx2cIssues.csv

@@ -1,4 +1,4 @@
-"Issue #","Issue Name","Meeting","Status","First released version","Notes"
+"Issue #","Issue Name","Meeting","Status","First released version","GitHub issue","Notes"
 "`LWG2994 <https://wg21.link/LWG2994>`__","Needless UB for ``basic_string`` and ``basic_string_view``","2023-06 (Varna)","|Complete|","5","`#105268 <https://github.com/llvm/llvm-project/issues/105268>`__",""
 "`LWG3884 <https://wg21.link/LWG3884>`__","``flat_foo`` is missing allocator-extended copy/move constructors","2023-06 (Varna)","","","`#105269 <https://github.com/llvm/llvm-project/issues/105269>`__",""
 "`LWG3885 <https://wg21.link/LWG3885>`__","``op`` should be in [zombie.names]","2023-06 (Varna)","|Nothing To Do|","","`#105270 <https://github.com/llvm/llvm-project/issues/105270>`__",""

libcxx/docs/Status/Cxx2cPapers.csv

@@ -1,4 +1,4 @@
-"Paper #","Paper Name","Meeting","Status","First released version","Notes"
+"Paper #","Paper Name","Meeting","Status","First released version","GitHub issue","Notes"
 "`P2497R0 <https://wg21.link/P2497R0>`__","Testing for success or failure of ``<charconv>`` functions","2023-06 (Varna)","|Complete|","18","`#105357 <https://github.com/llvm/llvm-project/issues/105357>`__",""
 "`P2592R3 <https://wg21.link/P2592R3>`__","Hashing support for ``std::chrono`` value classes","2023-06 (Varna)","","","`#105358 <https://github.com/llvm/llvm-project/issues/105358>`__",""
 "`P2587R3 <https://wg21.link/P2587R3>`__","``to_string`` or not ``to_string``","2023-06 (Varna)","","","`#105359 <https://github.com/llvm/llvm-project/issues/105359>`__",""