Remove comments referring to deprecated functions recently removed

Author: joto

include/osmium/memory/buffer.hpp

@@ -87,12 +87,6 @@ namespace osmium {
          * the buffer isn't used any more. If you don't have memory already, you can
          * create a Buffer object and have it manage the memory internally. It will
          * dynamically allocate memory and free it again after use.
-         *
-         * By default, if a buffer gets full it will throw a buffer_is_full exception.
-         * You can use the set_full_callback() method to set a callback functor
-         * which will be called instead of throwing an exception. The full
-         * callback functionality is deprecated and will be removed in the
-         * future. See the documentation for set_full_callback() for alternatives.
          */
         class Buffer {
 
@@ -500,18 +494,11 @@ namespace osmium {
              * Note that you have to eventually call commit() to actually
              * commit this data.
              *
-             * If there isn't enough space in the buffer, one of three things
+             * If there isn't enough space in the buffer, one of two things
              * can happen:
              *
-             * * If you have set a callback with set_full_callback(), it is
-             *   called. After the call returns, you must have either grown
-             *   the buffer or cleared it by calling buffer.clear(). (Usage
-             *   of the full callback is deprecated and this functionality
-             *   will be removed in the future. See the documentation for
-             *   set_full_callback() for alternatives.
-             * * If no callback is defined and this buffer uses internal
-             *   memory management, the buffers capacity is grown, so that
-             *   the new data will fit.
+             * * If this buffer uses internal memory management, the buffers
+             *   capacity is grown, so that the new data will fit.
              * * Else the buffer_is_full exception is thrown.
              *
              * @pre The buffer must be valid.