Removed resDeletionLog and unwrap from OverlayFS

Documented `MutexedFS.fs`

src/backends/mutexed.ts

@@ -46,7 +46,12 @@ export class MutexLock {
  * @internal
  */
 export class MutexedFS<FS extends FileSystem> implements FileSystem {
-	public constructor(public readonly fs: FS) {}
+	public constructor(
+		/**
+		 * The unmutexed FS that is being wrapped
+		 */
+		public readonly fs: FS
+	) {}
 
 	/**
 	 * The current locks

src/backends/overlay.ts

@@ -552,14 +552,6 @@ export class OverlayFS extends MutexedFS<UnmutexedOverlayFS> {
 	public getDeletionLog(): string {
 		return super.fs.getDeletionLog();
 	}
-
-	public resDeletionLog(): string {
-		return super.fs.getDeletionLog();
-	}
-
-	public unwrap(): UnmutexedOverlayFS {
-		return super.fs;
-	}
 }
 
 const _Overlay = {