PPAPI: Update pp_var.h documentation for Resource vars.

ppapi/c/ppb_var.h

Index: ppapi/c/ppb_var.h
diff --git a/ppapi/c/ppb_var.h b/ppapi/c/ppb_var.h
index 91a65921ae0286e44bb36937e4fe608cdca92457..88c17c50a79cb7ac5bb720f988314b2f1e0ccf92 100644
--- a/ppapi/c/ppb_var.h
+++ b/ppapi/c/ppb_var.h
@@ -3,7 +3,7 @@
  * found in the LICENSE file.
  */
 
-/* From ppb_var.idl modified Thu Feb  6 13:48:33 2014. */
+/* From ppb_var.idl modified Tue Apr  8 13:32:15 2014. */
 
 #ifndef PPAPI_C_PPB_VAR_H_
 #define PPAPI_C_PPB_VAR_H_
@@ -44,9 +44,13 @@ struct PPB_Var_1_2 {
   void (*AddRef)(struct PP_Var var);
   /**
    * Release() removes a reference to given var, deleting it if the internal
-   * reference count becomes 0. If the given var is not a refcounted object,
-   * this function will do nothing so you can always call it no matter what
-   * the type.
+   * reference count becomes 0. If the <code>PP_Var</code> is of type
+   * <code>PP_VARTYPE_RESOURCE</code>,
+   * it will implicitly release a reference count on the
+   * <code>PP_Resource</code> (equivalent to PPB_Core::ReleaseResource()).
+   *
+   * If the given var is not a refcounted object, this function will do nothing
+   * so you can always call it no matter what the type.
    *
    * @param[in] var A <code>PP_Var</code> that will have a reference removed.
    */
@@ -106,7 +110,9 @@ struct PPB_Var_1_2 {
    */
   PP_Resource (*VarToResource)(struct PP_Var var);
   /**
-   * Creates a new <code>PP_Var</code> from a given resource.
+   * Creates a new <code>PP_Var</code> from a given resource. Implicitly adds a
+   * reference count on the <code>PP_Resource</code> (equivalent to
+   * <code>PPB_Core::AddRefResource(resource)</code>).
    *
    * @param[in] resource A <code>PP_Resource</code> to be wrapped in a var.
    *