feat: update stats in overview

Signed-off-by: Brian McGee <brian@bmcgee.ie>

docs/usage.md

@@ -16,12 +16,6 @@ treefmt [FLAGS] [OPTIONS] [--] [paths]...
 
 ## Flags
 
-`--walk <auto|git|filesystem>`
-
-> The method used to traverse the files within `<tree-root>`.
-> Default is `auto`, where we will detect if the `<tree-root>` is a git repository and use the `git` walker for
-> traversal. If not we will fall back to the `filesystem` walker.
-
 `--allow-missing-formatter`
 
 > Do not exit with an error if some of the configured formatters are missing.