docs: correct getting-started behaviors (openai#5407)

Author: tibo-openai

docs/getting-started.md

@@ -43,14 +43,6 @@ You can also run Codex CLI with a prompt as input:
 codex "explain this codebase to me"
 ```
 
-```shell
-codex --full-auto "create the fanciest todo-list app"
-```
-
-That's it - Codex will scaffold a file, run it inside a sandbox, install any
-missing dependencies, and show you the live result. Approve the changes and
-they'll be committed to your working directory.
-
 ### Example prompts
 
 Below are a few bite-size examples you can copy-paste. Replace the text in quotes with your own task.
@@ -69,11 +61,10 @@ Looking to reuse your own instructions? Create slash commands with [custom promp
 
 ### Memory with AGENTS.md
 
-You can give Codex extra instructions and guidance using `AGENTS.md` files. Codex looks for `AGENTS.md` files in the following places, and merges them top-down:
+You can give Codex extra instructions and guidance using `AGENTS.md` files. Codex looks for them in the following places, and merges them top-down:
 
 1. `~/.codex/AGENTS.md` - personal global guidance
-2. `AGENTS.md` at repo root - shared project notes
-3. `AGENTS.md` in the current working directory - sub-folder/feature specifics
+2. Every directory from the repository root down to your current working directory (inclusive). In each directory, Codex first looks for `AGENTS.override.md` and uses it if present; otherwise it falls back to `AGENTS.md`. Use the override form when you want to replace inherited instructions for that directory.
 
 For more information on how to use AGENTS.md, see the [official AGENTS.md documentation](https://agents.md/).