docs(heap_debug): Add missing information

- Place the section on alloc failed hook at a better place
- Add reference to the different poisoning configs at the beginning
  of the heap corruption detectino section
- Update the information concerning heap tracing
- Update the heap tracing log examples
- Fix heap tracing standalone code:
  - Update the logging format in heap_trace_dump_base
  - Add freed field in trace stucture to keep this info even
    when no call stack is available

components/heap/include/heap_trace.inc

@@ -122,6 +122,7 @@ static HEAP_IRAM_ATTR __attribute__((noinline)) void *trace_malloc(size_t alignm
         .address = p,
         .ccount = ccount,
         .size = size,
+        .freed = false,
     };
     get_call_stack(rec.alloced_by);
     record_allocation(&rec);