tweak cljs.core/*target* docstring

Author: swannodette

src/cljs/cljs/core.cljs

@@ -19,9 +19,10 @@
 
 (def
   ^{:dynamic true
-    :doc "Var bound to the name value of the compiler build :target
-  option. If compiler build :target is :nodejs, *target* will be bound to
-  \"nodejs\"."
+    :doc "Var bound to the name value of the compiler build :target option.
+  For example, if the compiler build :target is :nodejs, *target* will be bound
+  to \"nodejs\". *target* is a Google Closure define and can be set by compiler
+  :closure-defines option."
     :jsdoc ["@define {string}"]}
   *target* "default")