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Galaxies: clarify wording of completion condition.

A user mailed me today having found it less than clear from the docs
that Galaxies will only accept a solution if the set of filled-in grid
edges consists of _exactly_ the ones that separate two distinct
regions, rather than consisting of _at least_ those and perhaps others
which neither break rotational symmetry or disconnect any region.

--- a/html/galaxies.html

+++ b/html/galaxies.html

@@ -1,8 +1,12 @@

 Galaxies

 <p>

-Draw lines along grid edges so as to divide the grid up into

-regions. Every region should have two-way rotational symmetry, and

-should contain exactly one dot which is in its centre.

+Draw lines along grid edges so as to divide the grid up into connected

+regions of squares.

+<p>

+Every region should have two-way rotational symmetry, should contain

+exactly one dot which is in its centre, and should contain no lines

+separating two of its own squares from each other. A region satisfying

+all of these requirements will be automatically highlighted.

 <p>

 Click on a grid edge to add or remove a line. Right-click on a dot

 and drag the mouse to place an arrow in a grid square pointing to

--- a/puzzles.but

+++ b/puzzles.but

@@ -2400,11 +2400,16 @@

 \cfg{winhelp-topic}{games.galaxies}

 You have a rectangular grid containing a number of dots. Your aim is

-to draw edges along the grid lines which divide the rectangle into

-regions in such a way that every region is 180\u00b0{-degree}

-rotationally symmetric, and contains exactly one dot which is

-located at its centre of symmetry.

+to partition the rectangle into connected regions of squares, in such

+a way that every region is 180\u00b0{-degree} rotationally symmetric,

+and contains exactly one dot which is located at its centre of

+symmetry.

+To enter your solution, you draw lines along the grid edges to mark

+the boundaries of the regions. The puzzle is complete when the marked

+lines on the grid are precisely those that separate two squares

+belonging to different regions.

+

 This puzzle was invented by \i{Nikoli} \k{nikoli-galaxies}, under

 the name \q{Tentai Show}; its name is commonly translated into

 English as \q{Spiral Galaxies}.

@@ -2418,11 +2423,11 @@

 \IM{Galaxies controls} controls, for Galaxies

 Left-click on any grid line to draw an edge if there isn't one

-already, or to remove one if there is. When you create a valid

-region (one which is closed, contains exactly one dot, is

-180\u00b0{-degree} symmetric about that dot, and contains no

-extraneous edges inside it) it will be highlighted automatically; so

-your aim is to have the whole grid highlighted in that way.

+already, or to remove one if there is. When you create a valid region

+(one which is closed, contains exactly one dot, is 180\u00b0{-degree}

+symmetric about that dot, and contains no extraneous edges between two

+of its own squares), it will be highlighted automatically; so your aim

+is to have the whole grid highlighted in that way.

 During solving, you might know that a particular grid square belongs

 to a specific dot, but not be sure of where the edges go and which