Merge pull request #78328 from Milopetilo/fix-overmap-doc-table

Fix table in OVERMAP.md

doc/OVERMAP.md

@@ -267,6 +267,7 @@ rotation for the referenced overmap terrains (e.g. the `_north` version for all)
 ### `see_cost` values
 
 | name | role |
+|------|------|
 | `"all_clear"` | This tile has no or minimal horizontal obstacles and can be seen down through |
 | `"none"` | This tile has no or minimal horizontal obstacles - most flat terrain |
 | `"low"` | This tile has low horizontal obstacles or few higher obstacles |