docs: Fix wrong variable name
@@ -1740,7 +1740,7 @@ volume mounted on the host).
The `container-dest` must always be an absolute path such as `/src/docs`.
The `host-src` can either be an absolute path or a `name` value. If you
-supply an absolute path for the `host-dir`, Docker bind-mounts to the path
+supply an absolute path for the `host-src`, Docker bind-mounts to the path
you specify. If you supply a `name`, Docker creates a named volume by that `name`.
A `name` value must start with an alphanumeric character,
