docs: oci-dir does not support compress as suggested

The docs have this note for the `--compress` flag

> Note: This flag can only be set with --format=docker-dir.

Yet the provided example has `--compress` with `--format=oci-dir`

Signed-off-by: gardar <[email protected]>

Author: gardar

docs/source/markdown/podman-save.1.md.in

@@ -75,7 +75,7 @@ $ podman save -o oci-alpine.tar --format oci-archive alpine
 ```
 
 ```
-$ podman save --compress --format oci-dir -o alp-dir alpine
+$ podman save --compress --format docker-dir -o alp-dir alpine
 Getting image source signatures
 Copying blob sha256:2fdfe1cd78c20d05774f0919be19bc1a3e4729bce219968e4188e7e0f1af679d
  1.97 MB / 1.97 MB [========================================================] 0s