docs: add clarification to executable param (#1158)

changelog/1158.doc.rst

@@ -0,0 +1 @@
+Adding some clarifying documentation around the executable parameters of audio classes based off of internal discussions.

disnake/player.py

@@ -126,6 +126,12 @@ class FFmpegAudio(AudioSource):
     :class:`FFmpegOpusAudio` work should subclass this.
 
     .. versionadded:: 1.3
+
+    .. danger::
+
+        As this wraps a subprocess call, ensure that
+        arguments such as ``executable`` are not
+        set from direct user input.
     """
 
     def __init__(
@@ -240,6 +246,11 @@ class FFmpegPCMAudio(FFmpegAudio):
         passed to the stdin of ffmpeg.
     executable: :class:`str`
         The executable name (and path) to use. Defaults to ``ffmpeg``.
+
+        .. danger::
+
+            As this wraps a subprocess call, ensure that
+            this argument is not set from direct user input.
     pipe: :class:`bool`
         If ``True``, denotes that ``source`` parameter will be passed
         to the stdin of ffmpeg. Defaults to ``False``.
@@ -342,6 +353,11 @@ class FFmpegOpusAudio(FFmpegAudio):
 
     executable: :class:`str`
         The executable name (and path) to use. Defaults to ``ffmpeg``.
+
+        .. danger::
+
+            As this wraps a subprocess call, ensure that
+            this argument is not set from direct user input.
     pipe: :class:`bool`
         If ``True``, denotes that ``source`` parameter will be passed
         to the stdin of ffmpeg. Defaults to ``False``.