[DOCS] Fix formatting

Author: jrodewig

docs/reference/analysis/tokenfilters/cjk-bigram-tokenfilter.asciidoc

@@ -158,7 +158,7 @@ Possible values:
 All non-CJK input is passed through unmodified.
 --
 
-`output_unigrams`
+`output_unigrams`::
 (Optional, Boolean)
 If `true`, emit tokens in both bigram and
 {wikipedia}/N-gram[unigram] form. If `false`, a CJK character