[Docs] Correct default stop list constant (#41342)

docs/reference/analysis/analyzers/fingerprint-analyzer.asciidoc

@@ -68,7 +68,7 @@ The `fingerprint` analyzer accepts the following parameters:
 `stopwords`::
 
     A pre-defined stop words list like `_english_` or an array  containing a
-    list of stop words.  Defaults to `\_none_`.
+    list of stop words.  Defaults to `_none_`.
 
 `stopwords_path`::
 

docs/reference/analysis/analyzers/pattern-analyzer.asciidoc

@@ -159,7 +159,7 @@ The `pattern` analyzer accepts the following parameters:
 `stopwords`::
 
     A pre-defined stop words list like `_english_` or an array  containing a
-    list of stop words.  Defaults to `\_none_`.
+    list of stop words.  Defaults to `_none_`.
 
 `stopwords_path`::