Fix up some minor issues with the special node editing dialog

- Also: merge "nuke monsters" and "destroy monster" nodes, since the action of the "destroy monster" node isn't what it sounds like; now it simply destroys a single monster on a specific space

rsrc/strings/specials-text-town.txt

@@ -198,8 +198,8 @@ Second part of message
 Unused
 Unused
 Unused
-Type of creature to remove
-Unused
+X coordinate of space
+Y coordinate of space
 Unused
 Unused
 Unused
@@ -214,7 +214,7 @@ Second part of message
 Unused
 Unused
 Unused
-0 - all, 1 - friendly, 2 - hostile
+Type (or 0 - all, -1 - friendly, -2 - hostile)
 Unused
 Unused
 Unused
@@ -398,7 +398,7 @@ Unused
 Unused
 Special to Jump To
 --------------------
-Start General Timer
+Start Town Timer
 Unused
 Unused
 First part of message