[1.5.x] Fixed #20146 -- Updated removed_tags example

Backport of e5d252f5b9 from master.

docs/ref/utils.txt

@@ -570,11 +570,11 @@ escaping HTML.
 
 .. function:: remove_tags(value, tags)
 
-    Removes a list of [X]HTML tag names from the output.
+    Removes a space-separated list of [X]HTML tag names from the output.
 
     For example::
 
-        remove_tags(value, ["b", "span"])
+        remove_tags(value, "b span")
 
     If ``value`` is ``"<b>Joel</b> <button>is</button> a <span>slug</span>"`` the
     return value will be ``"Joel <button>is</button> a slug"``.