forgot to clean up last engine modes

docs/engines.md

@@ -41,17 +41,22 @@ This is an exact recreation of 0x0.st's algorithm, so I'll also steal their grap
           0                      256.0                      512.0
                                                               MiB
 ```
+
 The numbers are a little different, depending on how your config looks, but it works the same.
 
+```python3
+stat = os.stat(os.path.join(config['UPLOAD_FOLDER'], f))
+  systime = time.time()
+  age = timedelta(seconds = systime - stat.st_mtime).days
+  maxage = mind + (-maxd + mind) * (stat.st_size / maxs - 1) ** 3
+  if age >= maxage:
+    delete_file(f)
+```
+
+## Engine Mode 3 (Hybrid 'Popularity' Based)
+
+Files are deleted on a aggregate score based on size and popularity (large, popular files are kept alive longer, vs unpopular files most likely just used once)
 
-    ```python3
-    stat = os.stat(os.path.join(config['UPLOAD_FOLDER'], f))
-      systime = time.time()
-      age = timedelta(seconds = systime - stat.st_mtime).days
-      maxage = mind + (-maxd + mind) * (stat.st_size / maxs - 1) ** 3
-      if age >= maxage:
-        delete_file(f)
-    ```
+## Engine Mode 4 (Lazy-Hybrid 'Popularity' Based)
 
-3. Hybrid 'popularity' deletion - Files are deleted on a aggregate score based on size and popularity (large, popular files are kept alive longer, vs unpopular files most likely just used once)
-4. Lazy-Hybrid 'popularity' deletion - Files are deleted on size AND last view, depending on what comes last (small files stay the same, long files have potential to stay alive longer)
+Files are deleted on size AND last view, depending on what comes last (small files stay the same, long files have potential to stay alive longer)
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