Update full-text-search.md

Note about how Milvus Lite doesn't have full-text search implemented

site/en/userGuide/search-query-get/full-text-search.md

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+Full-text search is currently available in Milvus Standalone and Milvus Distributed but not Milvus Lite, although adding it to Milvus Lite is on the roadmap.
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 ## Overview​
 
 Full text search simplifies the process of text-based searching by eliminating the need for manual embedding. This feature operates through the following workflow:​