Docs: Encourage to used Python 3

docs/en/api-guides/build-system.rst

@@ -178,14 +178,15 @@ For more detailed information about integrating ESP-IDF with CMake into an IDE,
 
 .. _setting-python-interpreter:
 
-Setting the Python Interpreter
-------------------------------
+Setting up the Python Interpreter
+---------------------------------
 
-Currently, ESP-IDF only works with Python 2.7. If you have a system where the default ``python`` interpreter is Python 3.x, this can lead to problems.
+ESP-IDF works well with all supported Python versions. It should work out-of-box even if you have a legacy system where the default ``python`` interpreter is still Python 2.7, however, it is advised to switch to Python 3 if possible.
 
-If using ``idf.py``, running ``idf.py`` as ``python2 $IDF_PATH/tools/idf.py ...`` will work around this issue (``idf.py`` will tell other Python processes to use the same Python interpreter). You can set up a shell alias or another script to simplify the command.
+``idf.py`` and other Python scripts will run with the default Python interpreter, i.e. ``python``. You can switch to a
+different one like ``python3 $IDF_PATH/tools/idf.py ...``, or you can set up a shell alias or another script to simplify the command.
 
-If using CMake directly, running ``cmake -D PYTHON=python2 ...`` will cause CMake to override the default Python interpreter.
+If using CMake directly, running ``cmake -D PYTHON=python3 ...`` will cause CMake to override the default Python interpreter.
 
 If using an IDE with CMake, setting the ``PYTHON`` value as a CMake cache override in the IDE UI will override the default Python interpreter.