docs: update description for BitmapFactory.Options#inBitmap

        /**

         * If set, decode methods that take the Options object will attempt to

         * reuse this bitmap when loading content. If the decode operation

         * cannot use this bitmap, the decode method will return

         * <code>null</code> and will throw an IllegalArgumentException. The

         * cannot use this bitmap, the decode method will throw an

         * {@link java.lang.IllegalArgumentException}. The

         * current implementation necessitates that the reused bitmap be

         * mutable, and the resulting reused bitmap will continue to remain

         * mutable even when decoding a resource which would normally result in