Fix gdx-field and improve comments

src/play_clj/core_global.clj

@@ -146,6 +146,8 @@
   `(let [^Sound object# ~object]
      (u/call! object# ~k ~@options)))
 
+; assets
+
 (defn ^:private loader-init
   "Internal use only"
   [k]

src/play_clj/core_graphics.clj

@@ -1,6 +1,6 @@
 (in-ns 'play-clj.core)
 
-; misc
+; utilities
 
 (defmacro usage
   "Returns a static field in [VertexAttributes.Usage](http://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/graphics/VertexAttributes.Usage.html)"

src/play_clj/g3d.clj

@@ -19,7 +19,7 @@
 (defmacro animation-controller
   "Returns an [AnimationController](http://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/graphics/g3d/utils/AnimationController.html)
 
-    (animation-controller entity)"
+    (animation-controller model-entity)"
   [entity & options]
   `(let [^AnimationController object# (animation-controller* ~entity)]
      (u/calls! object# ~@options)))

src/play_clj/utils.clj

@@ -69,7 +69,7 @@
   "Internal use only"
   [args divider]
   (let [[a1 a2] (take-last 2 args)]
-    (conj (vec (drop-last 2 args)) (str (name a1) divider a2))))
+    (conj (vec (drop-last 2 args)) (str (name a1) divider (name a2)))))
 
 (defn gdx
   "Returns a fully-qualified LibGDX symbol"