docs: small text added

src/netius/common/http.py

@@ -463,7 +463,7 @@ def parse_closed(self):
         """
         "Parses" the closed event, which may trigger a changed in state
         for very specific conditions, which is the case of a plain encoded
-        connection with no explicit content length defined.
+        connection with no explicit content length defined in HTTP/1.1 or older.
 
         In these situations the closing of a connection should be seen as
         the sending of a EOF character (with semantic value).