[Docs] Tweak some markup

Author: bbatsov

doc/modules/ROOT/pages/usage/pretty_printing.adoc

@@ -23,8 +23,8 @@ of data on top of fipp, but at a slight performance cost.
 * `zprint` to use https://github.com/kkinnear/zprint[zprint], a fast and
 flexible alternative to the libraries mentioned above.
 
-For `fipp`, `puget`, and `zprint` printers to work, you need to add a
-respective dependency into your project explicitly.
+IMPORTANT: For `fipp`, `puget`, and `zprint` printers to work, you need to add a
+respective dependency in your project explicitly.
 
 Alternatively, `cider-print-fn` can be set to the namespace-qualified name of a
 Clojure var whose function takes three arguments: the object to print, the