Fix cast of char8_t to char. Has to use reinterpret_cast.

Author: gaspard

01-string-and-character-literals.md

@@ -156,7 +156,7 @@ The following table lists C++ types, sizes, target encodings, literals and objec
 | char32_t |   32  |  UTF-32  |     U"abcd"    |        U'a'       |     UR"(abcd)"     |  u32string  |      n/a      |   no    |
 |  wchar_t | 16/32 |   n/a +  |     L"abcd"    |        L'a'       |     LR"(abcd)"     |   wstring   |  wcout/wcerr  |   no    |
 
-&#42; An explicit cast to type `char` in `operator<<` may be required when using `cout`/`cerr`, for example: `cout << static_cast<char>(u8"Hello \u20AC!\n");`.
+&#42; An explicit cast to type `char` in `operator<<` may be required when using `cout`/`cerr`, for example: `cout << reinterpret_cast<const char*>(u8"Hello \u20AC!\n");`.
 
 &#43; The `wchar_t` encoding and streams under Windows are 16-bit and support UTF-16.