[libc++] [docs] Mark LWG3055 as complete. Use string_view instead of string in path::operator+=(ECharT).
The issue didn't change the behaviour which is tested in libcxx/test/std/input.output/filesystems/class.path/path.member/path.concat.pass.cpp.
The change to use string_view instead of string is not strictly necessary.
<filesystem> was added in commit 998a5c88312066fcc2b2de1358edc76587611354 (Implement <filesystem>).
Reviewed By: #libc, ldionne
Differential Revision: https://reviews.llvm.org/D92731
GitOrigin-RevId: bf8683adfa39d53c223cf8b98fa036e835c9570e
2 files changed
