raw_logging: Document that AbortHook's buffers live for as long as the process remains alive.

PiperOrigin-RevId: 446725910
Change-Id: I291fa8c1c41155b1530969f64b2b7f44b1576c92

absl/base/internal/raw_logging.h

@@ -161,6 +161,9 @@ using LogFilterAndPrefixHook = bool (*)(absl::LogSeverity severity,
 // The NUL-terminated logged message lives in the buffer between 'buf_start'
 // and 'buf_end'.  'prefix_end' points to the first non-prefix character of the
 // buffer (as written by the LogFilterAndPrefixHook.)
+//
+// The lifetime of the filename and message buffers will not end while the
+// process remains alive.
 using AbortHook = void (*)(const char* file, int line, const char* buf_start,
                            const char* prefix_end, const char* buf_end);