Improve comments around logging

src/re_frame/core.cljs

@@ -3,6 +3,7 @@
     [re-frame.handlers   :as handlers]
     [re-frame.subs       :as subs]
     [re-frame.router     :as router]
+    [re-frame.utils      :as utils]
     [re-frame.middleware :as middleware]))
 
 
@@ -34,13 +35,13 @@
 
 
 ;; --  Logging -----
-;; re-frame uses a few utility logging functions: warn, log, error, group and groupEnd
-;; By default they use the js/console implementations
-;; But you can override:
+;; re-frame uses the logging functions: warn, log, error, group and groupEnd
+;; By default, these functions map directly to the js/console implementations
+;; But you can override with your own (set or subset):
 ;;   (set-loggers!  {:warn  my-warn   :log  my-looger ...})
-;; The functions you supply will be given a string.
 (def set-loggers! utils/set-loggers!)
 
+
 ;; --  Convenience API -------
 
 ;; Almost 100% of handlers will be pure, so make it easy to