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Tweak a paragraph after discussion with Simon.

[originally from svn r6144]

--- a/devel.but

+++ b/devel.but

@@ -833,12 +833,12 @@

 \cw{changed_state()} function clears the current selection whenever

 it is called.

-Any call to \cw{changed_state()} can be sure that there will be a

-subsequent call to \cw{anim_length()} and \cw{flash_length()}. So

-\cw{changed_state()} can set up data in the \c{game_ui} which will

-be read by \cw{anim_length()} and \cw{flash_length()}, and not have

-to worry about those functions being called without the data having

-been uninitialised.

+When \cw{anim_length()} or \cw{flash_length()} are called, you can

+be sure that there has been a previous call to \cw{changed_state()}.

+So \cw{changed_state()} can set up data in the \c{game_ui} which will

+be read by \cw{anim_length()} and \cw{flash_length()}, and those

+functions will not have to worry about being called without the data

+having been initialised.

 \H{backend-moves} Making moves