Update attic read-me.

[ci skip]

attic/README.md

@@ -2,23 +2,23 @@ This directory contains old art and resources not currently used anywhere in
 the game.  It should not ship with the distribution tarball.
 Some notes on specific images and image groups follow:
 
-scepter_of_fire.png:
-   Old story image of the Scepter, quite large.
-
-units/thain.png,units/thain2.png:
-   Originally from SoF.  1.3-sized.
-
-desert-elvish-druid-statue.png, desert-elvish-shyde-statue:
-   Used in older versions of UtBS. 1.3-sized.
+clasher-attack-mace.png
+   Orphaned when the Drake Clasher lost this attack.
 
 keratur.png:
    The original image for the uncloaked assassin in UtBS.  1.3-sized.
 
+ratheln.png:
+   Originally from THoT. No longer used, removed in GitHub #6593.
+
+scepter_of_fire.png:
+   Old story image of the Scepter, quite large.
+
 spider-lich.png:
    Old unit image from UtBS.
 
-clasher-attack-mace.png
-   Orphaned when the Drake Clasher lost this attack.
+thain.png,thain2.png:
+   Originally from SoF.  1.3-sized.
 
 units/fire-dragon-flying-*.png
    Jetryl plans to finish these.  See FR #11041.