doc: add callback documentation in ExceptionHelper.

- add callback documentation in ExceptionHelper.
- fix other misc documentation issue.

src/ExceptionHelper.cpp

@@ -78,6 +78,8 @@ namespace YYCC::ExceptionHelper {
 			if (!m_IsRegistered) return;
 
 			// unregister handler
+			// reset user callback
+			m_UserCallback = nullptr;
 			// restore old handler
 			SetUnhandledExceptionFilter(m_PrevProcHandler);
 			m_PrevProcHandler = nullptr;

src/YYCCInternal.hpp

@@ -46,21 +46,21 @@ namespace YYCC {
 #endif
 }
 /**
-	\typedef yycc_char8_t
+	\typedef YYCC::yycc_char8_t
 	\brief YYCC UTF8 char type.
 	\details
 	This char type is an alias to \c std::char8_t if your current C++ standard support it.
 	Otherwise it is defined as <TT>unsigned char</TT> as C++ 20 stdandard does.
 */
 /**
-	\typedef yycc_u8string
+	\typedef YYCC::yycc_u8string
 	\brief YYCC UTF8 string container type.
 	\details
 	This type is defined as \c std::basic_string<yycc_char8_t>.
 	It is equal to \c std::u8string if your current C++ standard support it.
 */
 /**
-	\typedef yycc_u8string_view
+	\typedef YYCC::yycc_u8string_view
 	\brief YYCC UTF8 string view type.
 	\details
 	This type is defined as \c std::basic_string_view<yycc_char8_t>.