[Docs] Correct spelling of "_none_"
@@ -78,4 +78,4 @@ Elasticsearch provides the following predefined list of languages:
`_portuguese_`, `_romanian_`, `_russian_`, `_sorani_`, `_spanish_`,
`_swedish_`, `_thai_`, `_turkish_`.
-For the empty stopwords list (to disable stopwords) use: `\_none_`.
+For the empty stopwords list (to disable stopwords) use: `_none_`.
