[libc++][spaceship][NFC] P0905R1: Symmetry for spaceship - mark as implemented (llvm#87871)

Implemented: https://wg21.link/P0905R1 in
0913ca1
- https://eel.is/c++draft/cmp.weakeq (Removed in
https://wg21.link/P1959R0)
- https://eel.is/c++draft/cmp.strongeq (Removed in
https://wg21.link/P1959R0)
- https://eel.is/c++draft/cmp.partialord
-
https://github.com/llvm/llvm-project/blob/4abb722ffa7fcf809faa4a479fdf2f78c685b351/libcxx/include/__compare/ordering.h#L101
- https://eel.is/c++draft/cmp.weakord
-
https://github.com/llvm/llvm-project/blob/4abb722ffa7fcf809faa4a479fdf2f78c685b351/libcxx/include/__compare/ordering.h#L173
- https://eel.is/c++draft/cmp.strongord
-
https://github.com/llvm/llvm-project/blob/4abb722ffa7fcf809faa4a479fdf2f78c685b351/libcxx/include/__compare/ordering.h#L250

References:
- https://wg21.link/P1959R0 - Remove `std::weak_equality` and
`std::strong_equality`

Author: H-G-Hristov

libcxx/docs/Status/Cxx20Papers.csv

@@ -23,7 +23,7 @@
 "`P0754R2 <https://wg21.link/P0754R2>`__","LWG","<version>","Jacksonville","|Complete|","7.0"
 "`P0809R0 <https://wg21.link/P0809R0>`__","LWG","Comparing Unordered Containers","Jacksonville","|Nothing To Do|",""
 "`P0858R0 <https://wg21.link/P0858R0>`__","LWG","Constexpr iterator requirements","Jacksonville","|Complete|","12.0"
-"`P0905R1 <https://wg21.link/P0905R1>`__","CWG","Symmetry for spaceship","Jacksonville","","","|spaceship|"
+"`P0905R1 <https://wg21.link/P0905R1>`__","CWG","Symmetry for spaceship","Jacksonville","|Complete|","7.0","|spaceship|"
 "`P0966R1 <https://wg21.link/P0966R1>`__","LWG","``string::reserve``\  Should Not Shrink","Jacksonville","|Complete| [#note-P0966]_","12.0"
 "","","","","","",""
 "`P0019R8 <https://wg21.link/P0019R8>`__","LWG","Atomic Ref","Rapperswil","",""

libcxx/docs/Status/SpaceshipPapers.csv

@@ -7,6 +7,6 @@
 `LWG3360 <https://wg21.link/LWG3360>`_,``three_way_comparable_with`` is inconsistent with similar concepts,|Nothing To Do|,
 `LWG3380 <https://wg21.link/LWG3380>`_,``common_type`` and comparison categories,|Nothing To Do|,
 `LWG3395 <https://wg21.link/LWG3395>`_,Definition for *three-way* comparison needs to be updated,|Nothing To Do|,
-`P0905R1 <https://wg21.link/P0905R1>`_,Symmetry for spaceship,,
+`P0905R1 <https://wg21.link/P0905R1>`_,Symmetry for spaceship,|Complete|,7.0
 `P1120R0 <https://wg21.link/P1120R0>`_,Consistency improvements for ``<=>`` and other comparison operators,,
 `LWG3431 <https://wg21.link/LWG3431>`_,``<=>`` for containers should require ``three_way_comparable<T>`` instead of ``<=>``,,