Strengthen the note about ABI compatibility in tox.h.

toxcore/tox.api.h

@@ -428,19 +428,17 @@ typedef void log_cb(LOG_LEVEL level, string file, uint32_t line, string func, st
 
 static class options {
   /**
-   * This struct contains all the startup options for Tox. You can either
-   * allocate this object yourself, and pass it to $default, or call $new to get
-   * a new default options object.
+   * This struct contains all the startup options for Tox. You must $new to
+   * allocate an object of this type.
    *
-   * If you allocate it yourself, be aware that your binary will rely on the
-   * memory layout of this struct. In particular, if additional fields are added
-   * in future versions of the API, code that allocates it itself will become
-   * incompatible.
+   * WARNING: Although this struct happens to be visible in the API, it is
+   * effectively private. Do not allocate this yourself or access members
+   * directly, as it *will* break binary compatibility frequently.
    *
    * @deprecated The memory layout of this struct (size, alignment, and field
    * order) is not part of the ABI. To remain compatible, prefer to use $new to
    * allocate the object and accessor functions to set the members. The struct
-   * will become opaque (i.e. the definition will become private) in v0.1.0.
+   * will become opaque (i.e. the definition will become private) in v0.2.0.
    */
   struct this [get, set] {
     /**

toxcore/tox.h

@@ -477,19 +477,17 @@ typedef void tox_log_cb(Tox *tox, TOX_LOG_LEVEL level, const char *file, uint32_
 
 
 /**
- * This struct contains all the startup options for Tox. You can either
- * allocate this object yourself, and pass it to tox_options_default, or call tox_options_new to get
- * a new default options object.
+ * This struct contains all the startup options for Tox. You must tox_options_new to
+ * allocate an object of this type.
  *
- * If you allocate it yourself, be aware that your binary will rely on the
- * memory layout of this struct. In particular, if additional fields are added
- * in future versions of the API, code that allocates it itself will become
- * incompatible.
+ * WARNING: Although this struct happens to be visible in the API, it is
+ * effectively private. Do not allocate this yourself or access members
+ * directly, as it *will* break binary compatibility frequently.
  *
  * @deprecated The memory layout of this struct (size, alignment, and field
  * order) is not part of the ABI. To remain compatible, prefer to use tox_options_new to
  * allocate the object and accessor functions to set the members. The struct
- * will become opaque (i.e. the definition will become private) in v0.1.0.
+ * will become opaque (i.e. the definition will become private) in v0.2.0.
  */
 struct Tox_Options {