(PR#8904) dangerous terrains need documentation

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<URL: http://rt.freeciv.org/Ticket/Display.html?id=8904 >

Here is a patch.  Documentation is added to glaciers but none to triremes.

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Index: data/default/terrain.ruleset
===================================================================
RCS file: /home/freeciv/CVS/freeciv/data/default/terrain.ruleset,v
retrieving revision 1.35
diff -u -r1.35 terrain.ruleset
--- data/default/terrain.ruleset	8 Nov 2004 15:15:53 -0000	1.35
+++ data/default/terrain.ruleset	17 Nov 2004 05:19:37 -0000
@@ -220,7 +220,8 @@
 helptext	     = _("\
 Glaciers are found only in the most northerly or southerly\
  reaches of the world.  They are very cold, and hence difficult to\
- work with.\
+ work with.  This terrain is unsafe for units to travel on and is\
+ dangerous for triremes as well.\
 ")
 
 [terrain_desert]
Index: data/history/terrain.ruleset
===================================================================
RCS file: /home/freeciv/CVS/freeciv/data/history/terrain.ruleset,v
retrieving revision 1.15
diff -u -r1.15 terrain.ruleset
--- data/history/terrain.ruleset	14 Sep 2004 00:01:35 -0000	1.15
+++ data/history/terrain.ruleset	17 Nov 2004 05:19:38 -0000
@@ -217,7 +217,8 @@
 helptext	     = _("\
 Glaciers are found only in the most northerly or southerly\
  reaches of the world.  They are very cold, and hence difficult to\
- work with.\
+ work with.  This terrain is unsafe for units to travel on and is\
+ dangerous for triremes as well.\
 ")
 
 [terrain_desert]

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