[symfony#5373] Small tweak per Stof's comment

Author: weaverryan

cookbook/assetic/jpeg_optimize.rst

@@ -252,8 +252,8 @@ file:
 
 .. tip::
 
-    Instead of using Assetic and Jpegoptim, you can also compress and manipulate
-    images before serving them using the `LiipImagineBundle`_ community bundle.
+    For uploaded images, you can compress and manipulate them using the
+    `LiipImagineBundle`_ community bundle.
 
 .. _`Jpegoptim`: http://www.kokkonen.net/tjko/projects.html
 .. _`LiipImagineBundle`: http://knpbundles.com/liip/LiipImagineBundle