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/esp_heap_trace.h

@@ -7,6 +7,7 @@
 
 #include "sdkconfig.h"
 #include "sys/queue.h"
+#include <stdbool.h>
 #include <stdint.h>
 #include <esp_err.h>
 
@@ -34,6 +35,7 @@ typedef struct heap_trace_record_t {
     uint32_t ccount; ///< CCOUNT of the CPU when the allocation was made. LSB (bit value 1) is the CPU number (0 or 1).
     void *address;   ///< Address which was allocated. If NULL, then this record is empty.
     size_t size;     ///< Size of the allocation
+    bool freed;      ///< State of the allocation (false if not freed, true if freed)
     void *alloced_by[CONFIG_HEAP_TRACING_STACK_DEPTH]; ///< Call stack of the caller which allocated the memory.
     void *freed_by[CONFIG_HEAP_TRACING_STACK_DEPTH];   ///< Call stack of the caller which freed the memory (all zero if not freed.)
 #if CONFIG_HEAP_TRACING_STANDALONE