DATAREDIS-789 - Fixed Lua syntax error in reference documentation.

Original pull request: #324.

src/main/asciidoc/reference/redis-scripting.adoc

@@ -34,8 +34,8 @@ public class Example {
 
 [source,lua]
 ----
- -- checkandset.lua local 
- current = redis.call('GET', KEYS[1]) 
+ -- checkandset.lua
+ local current = redis.call('GET', KEYS[1]) 
  if current == ARGV[1]
    then redis.call('SET', KEYS[1], ARGV[2])
    return true