chore: add documentation RI

Code functionality left unchanged, only added docs where missing

close: N25B-298

test/integration/test_microphone_utils.py

@@ -7,6 +7,17 @@ from common.microphone_utils import MicrophoneUtils
 
 @pytest.fixture
 def pyaudio_instance():
+    """
+    A pytest fixture that provides an initialized PyAudio instance for tests
+    requiring microphone access.
+
+    It first initializes PyAudio. If a default input device (microphone) is not
+    found, the test is skipped  to avoid failures in environments
+    without a mic.
+
+    :return: An initialized PyAudio instance.
+    :rtype: pyaudio.PyAudio
+    """
     audio = pyaudio.PyAudio()
     try:
         audio.get_default_input_device_info()