Tweak slice examples

Author: sogaiu

examples/slice.janet

@@ -1,10 +1,10 @@
-(slice @[1 2 3]) # -> (1 2 3) (a new array!)
+(slice @[1 2 3]) # -> (1 2 3)
 (slice @[:a :b :c] 1) # -> (:b :c)
 (slice [:a :b :c :d :e] 2 4) # -> (:c :d)
-(slice [:a :b :d :d :e] 2 -1) # -> (:c :d :e)
-(slice [:a :b :d :d :e] 2 -2) # -> (:c :d)
-(slice [:a :b :d :d :e] 2 -4) # -> ()
-(slice [:a :b :d :d :e] 2 -10) # -> error: range error
+(slice [:a :b :c :d :e] 2 -1) # -> (:c :d :e)
+(slice [:a :b :c :d :e] 2 -2) # -> (:c :d)
+(slice [:a :b :c :d :e] 2 -4) # -> ()
+(slice [:a :b :c :d :e] 2 -10) # -> error: end index -10 out of range [-6,5]
 (slice "abcdefg" 0 2) # -> "ab"
 (slice @"abcdefg" 0 2) # -> "ab"