Use proper example to autocreate the auth store

The current command shown in README does indeed autocreate the auth
store, but it fails to find a matched binding in the auth store.

README.md

@@ -59,8 +59,8 @@ configuration directory. On macOS and Linux, it tries the following locations:
 
 > [!NOTE]
 >
-> The authentication store can be automatically created with few examples
-> inside on first plugin activation, e.g. `http -A store https://pie.dev`.
+> The authentication store can be automatically created with few examples on
+> first plugin activation, e.g. `http -A store https://pie.dev/bearer`.
 
 The authentication store is a JSON file that contains two sections: `bindings`
 and `secrets`: