Colon added before code snippet (#516)

Hope it helps :)

Author: rafalbig

056_Sorting/88_String_sorting.asciidoc

@@ -22,7 +22,7 @@ and one that is `not_analyzed` for sorting.
 But  storing the same string twice in the `_source` field is waste of space.
 What we really want to do is to pass in a _single field_ but to _index it in two different ways_. All of the _core_ field types (strings, numbers,
 Booleans, dates) accept a `fields` parameter ((("mapping (types)", "transforming simple mapping to multifield mapping")))((("types", "core simple field types", "accepting fields parameter")))((("fields parameter")))((("multifield mapping")))that allows you to transform a
-simple mapping like
+simple mapping like:
 
 [source,js]
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