feat(pthread): Pthread can now use PSRAM as stack

Closes https://github.com/espressif/esp-idf/pull/10623
Closes https://github.com/espressif/esp-idf/issues/8662

Thanks to f-hoepfinger-hr-agrartechnik for the contribution
in https://github.com/espressif/esp-idf/pull/10623

docs/en/api-reference/system/mem_alloc.rst

@@ -14,6 +14,8 @@ Because {IDF_TARGET_NAME} uses multiple types of RAM, it also contains multiple
 
 For most purposes, the C Standard Library's ``malloc()`` and ``free()`` functions can be used for heap allocation without any special consideration. However, in order to fully make use of all of the memory types and their characteristics, ESP-IDF also has a capabilities-based heap memory allocator. If you want to have a memory with certain properties (e.g., :ref:`dma-capable-memory` or executable-memory), you can create an OR-mask of the required capabilities and pass that to :cpp:func:`heap_caps_malloc`.
 
+.. _memory_capabilities:
+
 Memory Capabilities
 -------------------