Updated SC2091 (markdown)

SC2091.md

@@ -26,6 +26,8 @@ The problem is when you use `$(date +%F)` alone as a command. Bash evaluates the
 
 Sometimes this results in this confounding `command not found` messages. Other times you get even stranger issues, like the example problematic code which always evaluates to false.
 
+The solution is simply to remove the surrounding `$()`. This will execute the command instead of the command's output.
+
 ### Exceptions:
 
 If you really want to execute the output of a command rather than the command itself, you can ignore this message.