Tweak reverse examples

Author: sogaiu

examples/reverse.janet

@@ -1,4 +1,3 @@
 (reverse [1 2 3]) # -> @[3 2 1]
-(reverse "abcdef") # -> @[102 101 100 99 98 97]
-(reverse :abc) # -> @[99 98 97]
+(reverse "abcdef") # -> @"fedcba"