[diff] Add entry for removed std::filesystem::path::string function

[Halalaluyafail3]

P2319R5 was accepted which removed std::filesystem::path::string, but there appears to be no mention of this in [diff]. Additionally:

\indexlibrarymember{system_encoded_string}{path}%
\indexlibrarymember{wstring}{path}%
\indexlibrarymember{u8string}{path}%
\indexlibrarymember{u16string}{path}%
\indexlibrarymember{u32string}{path}%
\begin{itemdecl}
std::string native_encoded_string() const;
std::wstring wstring() const;
std::u8string u8string() const;
std::u16string u16string() const;
std::u32string u32string() const;
\end{itemdecl}

It appears the library index member was not adjusted to follow LWG4512.

[frederick-vs-ja]

P2319R5 didn't remove any function. It just deprecated std::filesystem::path::string and std::filesystem::path::generic_string.

[Halalaluyafail3]

P2319R5 didn't remove any function. It just deprecated std::filesystem::path::string and std::filesystem::path::generic_string.

Oh ok, should the library \indexlibrarymember be updated at least?

[frederick-vs-ja]

P2319R5 didn't remove any function. It just deprecated std::filesystem::path::string and std::filesystem::path::generic_string.

Oh ok, should the library \indexlibrarymember be updated at least?

Definitely yes. Although this is only associated with LWG4512. (And the title of this issue is misleading.)