FreeRTOS viewer hints are not shown at all unless configUSE_TRACE_FACILITY macro is set to 1 #96

Dear maintainers,

I have discovered an issue with the "Hints" or "HTML help" for FreeRTOS view not showing at all, even though there are missing information in certain columns showing "?".

If I set the configUSE_TRACE_FACILITY macro to 1, only then the hints will be shown.

However, If I only set configRECORD_STACK_HIGH_ADDRESS macro to 1 to enable stack end, without setting configUSE_TRACE_FACILITY to 1, the hints will not be displayed.

I have created a PR to fix this: #95
I would appreciate if you could take the time to review it. Thank you.

Best regards,
Kennedy