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Docs: Add suggestion to turn of char8_t behavior for C++20 (#7025)

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@ -404,16 +404,12 @@ ImGui::Text(u8"こんにちは"); // this will always be encoded as UTF-8
ImGui::Text("こんにちは"); // the encoding of this is depending on compiler settings/flags and may be incorrect. ImGui::Text("こんにちは"); // the encoding of this is depending on compiler settings/flags and may be incorrect.
``` ```
Since C++20, because the C++ committee hate its users, they decided to change the `u8""` syntax to not return `const char*` but a new type `const char_t*` which doesn't cast to `const char*`. Since C++20, because the C++ committee hate its users, they decided to change the `u8""` syntax to not return `const char*` but a new type `const char8_t*` which doesn't cast to `const char*`.
Because of type usage of `u8""` in C++20 is a little more tedious: Because of type usage of `u8""` in C++20 is a little more tedious:
```cpp ```cpp
ImGui::Text((const char*)u8"こんにちは"); ImGui::Text((const char*)u8"こんにちは");
``` ```
We suggest using a macro in your codebase: However, you can disable this behavior completely using the compiler option [`/Zc:char8_t-`](https://learn.microsoft.com/en-us/cpp/build/reference/zc-char8-t?view=msvc-170) for MSVC and [`-fno-char8_t`](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1423r3.html) for Clang and GCC.
```cpp
#define U8(_S) (const char*)u8##_S
ImGui::Text(U8("こんにちは"));
```
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