Generated field is ml.tokens

The generated field name is `ml.tokens` and not `ml-tokens`.

docs/reference/search/search-your-data/semantic-search-elser.asciidoc

@@ -182,7 +182,7 @@ follow the progress. It may take a couple of minutes to complete the process.
 
 To perform semantic search, use the `text_expansion` query, and provide the 
 query text and the ELSER model ID. The example below uses the query text "How to 
-avoid muscle soreness after running?", the `ml-tokens` field contains the 
+avoid muscle soreness after running?", the `ml.tokens` field contains the 
 generated ELSER output:
 
 [source,console]