Document clear_whole_buffer in args.

hoomd/write/gsd_burst.py

@@ -39,6 +39,9 @@ class Burst(GSD):
         write_at_start (bool): When ``True`` **and** the file does not exist or
             has 0 frames: write one frame with the current state of the system
             when `hoomd.Simulation.run` is called. Defaults to ``False``.
+        clear_whole_buffer_after_dump (bool): When ``True`` the buffer is
+            emptied after calling `dump` each time. When ``False``, `dump` removes
+            frames from the buffer unil the ``end`` index. Defaults to ``True``.
 
     Warning:
         `Burst` errors when attempting to create a file or writing to one with
@@ -82,8 +85,8 @@ class Burst(GSD):
                 write_at_start = burst.write_at_start
 
         clear_whole_buffer_after_dump (bool): When ``True`` the buffer is
-        emptied after calling `dump` each time. If ``False`` only frames in the
-        buffer until the end frame will be deleted. Defaults to ``True``.
+            emptied after calling `dump` each time. When ``False``, `dump` removes
+            frames from the buffer unil the ``end`` index.
 
             .. rubric:: Example: