Update sun condition

At some point the sun condition docs had their order reworked so the problem with the "after dark" condition is now confusing. I've restructured it and make it clearer that the example isn't valid.

source/_docs/scripts/conditions.markdown

@@ -396,15 +396,6 @@ condition:
   after_offset: "-01:00:00"
 ```
 
-This is 'when dark' - equivalent to a state condition on `sun.sun` of `below_horizon`:
-
-```yaml
-condition:
-  - condition: sun
-    after: sunset
-    before: sunrise
-```
-
 This is 'when light' - equivalent to a state condition on `sun.sun` of `above_horizon`:
 
 ```yaml
@@ -414,7 +405,16 @@ condition:
     before: sunset
 ```
 
-We cannot use both keys in this case as it will always be `false`.
+This is (invalid) 'when dark' - equivalent to a state condition on `sun.sun` of `below_horizon`:
+
+```yaml
+condition:
+  - condition: sun
+    after: sunset
+    before: sunrise
+```
+
+However, we cannot use both keys in this case as it will always be `false`, so instead you have to use:
 
 ```yaml
 condition: