update description

Author: Maksim Sadym

Diff for: roadmap.md

@@ -93,7 +93,7 @@ This scenario loads a web page and prints it as a PDF. In spec terms, this invol
 
 ### Incognito mode
 
-This scenario creates a session with browser in incognito mode. In spec terms, this involves:
+This scenario initiates a browsing session in "private browsing" mode, ensuring that no noticeable side effects result from the creation of such a session. In spec terms, this involves:
 
 - [x] Some items from the previous milestones
 - [ ] Create session with isolation and deleting of cookies, site data, and browsing history.