Mod: Update installation doc page.

docs/installation.rst

@@ -25,13 +25,16 @@ The python requirements are automatically installed when using pip on this repos
 External requirements (AudioCaps only)
 ######################################
 
-The external requirements needed to download **AudioCaps** are **ffmpeg** and **youtube-dl** or **ytdlp**.
+The external requirements needed to download **AudioCaps** are **ffmpeg** and **youtube-dl** (yt-dlp should work too).
+These two programs can be download on Ubuntu using `sudo apt install ffmpeg youtube-dl`.
 
 You can also override their paths for AudioCaps:
 
 .. code-block:: python
 
     from aac_datasets import AudioCaps
-    AudioCaps.FFMPEG_PATH = "/my/path/to/ffmpeg"
-    AudioCaps.YOUTUBE_DL_PATH = "/my/path/to/youtube_dl_or_ytdlp"
-    dataset = AudioCaps(root=".", download=True)
+    dataset = AudioCaps(
+        download=True,
+        ffmpeg_path="/my/path/to/ffmpeg",
+        ytdl_path="/my/path/to/youtube_dl",
+    )