Fix type in ROADMAP.md

ROADMAP.md

@@ -78,7 +78,7 @@ Now follows an exhaustive list of every known Vim command that we could find.
 | :white_check_mark: | :1234: gg | goto line N (default: first line), on the first non-blank character                       |
 | :white_check_mark: | :1234: %  | goto line N percentage down in the file; N must be given, otherwise it is the `%` command |
 | :white_check_mark: | :1234: gk | up N screen lines (differs from "k" when line wraps)                                      |
-| :white_check_mark: | :1234: gj | own N screen lines (differs from "j" when line wraps)                                     |
+| :white_check_mark: | :1234: gj | down N screen lines (differs from "j" when line wraps)                                    |
 
 ## Text object motions