[libc++][spaceship][NFC] P1612R2: Mark remove `operator!=` from "Ranges Library" items as "Complete"

[H-G-Hristov]

Summary

Marked already implemented parts of P1612R2 as "Complete":

• ranges::iota_view::iterator https://reviews.llvm.org/D110774
• iota_view::sentinel https://reviews.llvm.org/D107396
• filter_view::iterator https://reviews.llvm.org/D109086
• filter_view::sentinel https://reviews.llvm.org/D109086
• ranges::transform_view::iterator https://reviews.llvm.org/D110774
• transform_view::sentinel https://reviews.llvm.org/D103056
• take_view::sentinel https://reviews.llvm.org/D123600
• join_view::iterator https://reviews.llvm.org/D107671
• join_view::sentinel https://reviews.llvm.org/D107671
• split_view::outer_iterator https://reviews.llvm.org/D142063
• split_view::inner_iterator https://reviews.llvm.org/D142063

Note these operators were added and removed in C++20.

[Mordante]

Thanks! LGTM!

libcxx/docs/Status/SpaceshipProjects.csv

 | `[counted.iter.cmp] <https://wg21.link/counted.iter.cmp>`_",| `counted_iterator <https://reviews.llvm.org/D106205>`_,None,Zoe Carver,|Complete|
 | `[unreachable.sentinel] <https://wg21.link/unreachable.sentinel>`_,| `unreachable_sentinel_t <https://reviews.llvm.org/D107920>`_,None,Zoe Carver,|Complete|
 "| `[istream.iterator] <https://wg21.link/istream.iterator>`_
 | `[istream.iterator.ops] <https://wg21.link/istream.iterator.ops>`_",| remove ops `istream_iterator <https://reviews.llvm.org/D119620>`_,None,Konstantin Varlamov,|Complete|
 "| `[istreambuf.iterator] <https://wg21.link/istreambuf.iterator>`_
 | `[istreambuf.iterator.ops] <https://wg21.link/istreambuf.iterator.ops>`_",| remove ops `istreambuf_iterator <https://reviews.llvm.org/D119620>`_,None,Konstantin Varlamov,|Complete|
 - `5.9 Clause 24: Ranges library <https://wg21.link/p1614r2#clause-24-ranges-library>`_,,,,
 | `[range.iota.iterator] <https://wg21.link/range.iota.iterator>`_,| `ranges::iota_view::iterator <https://reviews.llvm.org/D110774>`_,[concepts.cmp],Arthur O'Dwyer,|Complete|
-| `[range.iota.sentinel] <https://wg21.link/range.iota.sentinel>`_,| remove ops `iota_view::sentinel`,None,Unassigned,|Not Started|
-| `[range.filter.iterator] <https://wg21.link/range.filter.iterator>`_,| remove ops `filter_view::iterator`,None,Unassigned,|Not Started|
-| `[range.filter.sentinel] <https://wg21.link/range.filter.sentinel>`_,| remove ops `filter_view::sentinel`,None,Unassigned,|Not Started|
+| `[range.iota.sentinel] <https://wg21.link/range.iota.sentinel>`_,| remove ops `iota_view::sentinel <https://reviews.llvm.org/D107396>`_,None,Zoe Carver,|Complete|
+| `[range.filter.iterator] <https://wg21.link/range.filter.iterator>`_,| remove ops `filter_view::iterator <https://reviews.llvm.org/D109086>`_,None,Louis Dionne,|Complete|
+| `[range.filter.sentinel] <https://wg21.link/range.filter.sentinel>`_,| remove ops `filter_view::sentinel <https://reviews.llvm.org/D109086>`_,None,Louis Dionne,|Complete|
 | `[range.transform.iterator] <https://wg21.link/range.transform.iterator>`_,| `ranges::transform_view::iterator <https://reviews.llvm.org/D110774>`_,[concepts.cmp],Arthur O'Dwyer,|Complete|
-| `[range.transform.sentinel] <https://wg21.link/range.transform.sentinel>`_,| remove ops `transform_view::sentinel`,None,Unassigned,|Not Started|
-| `[range.take.sentinel] <https://wg21.link/range.take.sentinel>`_,| remove ops `take_view::sentinel`,None,Unassigned,|Not Started|
-| `[range.join.iterator] <https://wg21.link/range.join.iterator>`_,| remove ops `join_view::iterator`,None,Unassigned,|Not Started|
-| `[range.join.sentinel] <https://wg21.link/range.join.sentinel>`_,| remove ops `join_view::sentinel`,None,Unassigned,|Not Started|
-| `[range.split.outer] <https://wg21.link/range.split.outer>`_,| remove ops `split_view::outer_iterator`,None,Unassigned,|Not Started|
-| `[range.split.inner] <https://wg21.link/range.split.inner>`_,| remove ops `split_view::inner_iterator`,None,Unassigned,|Not Started|
+| `[range.transform.sentinel] <https://wg21.link/range.transform.sentinel>`_,| remove ops `transform_view::sentinel <https://reviews.llvm.org/D103056>`_,None,Zoe Carver,|Complete|
+| `[range.take.sentinel] <https://wg21.link/range.take.sentinel>`_,| remove ops `take_view::sentinel <https://reviews.llvm.org/D123600>`_,None,Konstantin Varlamov,|Complete|
+| `[range.join.iterator] <https://wg21.link/range.join.iterator>`_,| remove ops `join_view::iterator <https://reviews.llvm.org/D107671>`_,None,Zoe Carver,|Complete|
+| `[range.join.sentinel] <https://wg21.link/range.join.sentinel>`_,| remove ops `join_view::sentinel <https://reviews.llvm.org/D107671>`_,None,Zoe Carver,|Complete|
+| `[range.split.outer] <https://wg21.link/range.split.outer>`_,| remove ops `split_view::outer_iterator <https://reviews.llvm.org/D142063>`_,None,Hui Xie,|Complete|
+| `[range.split.inner] <https://wg21.link/range.split.inner>`_,| remove ops `split_view::inner_iterator <https://reviews.llvm.org/D142063>`_,None,Hui Xie,|Complete|
 - `5.10 Clause 25: Algorithms library <https://wg21.link/p1614r2#clause-25-algorithms-library>`_,,,,
 "| `[algorithm.syn] <https://wg21.link/algorithm.syn>`_
 | `[alg.three.way] <https://wg21.link/alg.three.way>`_",| `lexicographical_compare_three_way <https://reviews.llvm.org/D131395>`_,[comparisons.three.way],Adrian Vogelsgesang,|Complete|
 - `5.11 Clause 26: Numerics library <https://wg21.link/p1614r2#clause-26-numerics-library>`_,,,,
 "| `[complex.syn] <https://wg21.link/complex.syn>`_
 | `[complex.ops] <https://wg21.link/complex.ops>`_",| remove ops `complex <https://reviews.llvm.org/D152615>`_,None,Hristo Hristov,|Complete|
 "| `[class.slice.overview] <https://wg21.link/class.slice.overview>`_
 | `[slice.ops] <https://wg21.link/slice.ops>`_",| `slice <https://reviews.llvm.org/D152617>`_,None,Hristo Hristov,|Complete|