Fix typos in config.rs

Author: Gabatxo1312

src/config.rs

@@ -164,7 +164,7 @@ pub struct CategoryConfig {
     name: String,
     /// Path where to store the content symlinks.
     ///
-    /// This path is relative from the global `mqbittorrent_configedia_dir`, to allow moving
+    /// This path is relative from the global `media_dir`, to allow moving
     /// the entire collection.
     path: Utf8PathBuf,
 }