kdb merge man: Fix return value syntax
@@ -42,11 +42,14 @@ Strategies have their own [man page](/doc/help/elektra-cmerge-strategy.md) which
## RETURN VALUE
-0 on success.
+- 0:
+ Successful.
-1 if an error happened.
+- 1:
+ An error happened.
-2 if a merge conflict occurred and merge strategy abort was set.
+- 2:
+ A merge conflict occurred and merge strategy abort was set.
The result of the merge is stored in `result`.
