Make that error arrow even cooler

Author: fiadliel

doc/Guide.md

@@ -67,17 +67,14 @@ scala> metric"1"
 ```
 
 ```scala
-scala> val system = "http"
-system: String = http
-
 scala> val subsystem = "requests"
 subsystem: String = requests
 ```
 ```scala
 scala> metric"${system}_${subsystem}_total"
 <console>:18: error: Non-literal value supplied
        metric"${system}_${subsystem}_total"
-                ^
+                          ^
 ```
 
 ### Creating a monitoring variable

doc/src/Guide.md

@@ -57,7 +57,6 @@ metric"1"
 ```
 
 ```tut
-val system = "http"
 val subsystem = "requests"
 ```
 ```tut:fail