fix the validate-markdown issue

Co-authored-by: Ralf Handl <[email protected]>

Author: mgrafl

versions/3.1.1.md

@@ -157,7 +157,7 @@ The formats defined by the OAS are:
 `integer` | `int64` | signed 64 bits (a.k.a long)
 `number` | `float` | |
 `number` | `double` | |
-`string` | `password` | A hint to obscure/redact the value. 
+`string` | `password` | A hint to obscure/redact the value.
 
 ### <a name="richText"></a>Rich Text Formatting
 Throughout the specification `description` fields are noted as supporting CommonMark markdown formatting.