[DOCS] fixed broken json in multi term vectors docs
[DOCS] fixed broken json in multi term vectors docs

aparo/elasticsearch,aparo/elasticsearch,aparo/elasticsearch,fubuki/elasticsearch,vorce/es-metrics,vorce/es-metrics,fubuki/elasticsearch,aparo/elasticsearch,vorce/es-metrics,aparo/elasticsearch,aparo/elasticsearch,fubuki/elasticsearch,fubuki/elasticsearch,fubuki/elasticsearch,vorce/es-metrics,vorce/es-metrics,fubuki/elasticsearch