[CI:DOCS] Fix Mac pkg link

Fix download link to CI mac pkg and include universal pkg.

Signed-off-by: Ashley Cui <[email protected]>

DOWNLOADS.md

@@ -40,16 +40,17 @@ matches corresponding changes in the artifacts task.
   , and
   [rootlessport](https://api.cirrus-ci.com/v1/artifact/github/containers/podman/Artifacts/binary/rootlessport) -
   Built on the latest supported Fedora release.
-* MacOS,
-  [both x86_64](https://api.cirrus-ci.com/v1/artifact/github/containers/podman/Artifacts/binary/podman-installer-macos-amd64.pkg)
-  and
-  [aarch64 (ARM)](https://api.cirrus-ci.com/v1/artifact/github/containers/podman/Artifacts/binary/podman-installer-macos-aarch64.pkg)
-  installation packages.  Again, these are **not** signed, so expect warnings. There's
-  also binary release *ZIP-files* for
+* MacOS
+  [universal](https://api.cirrus-ci.com/v1/artifact/github/containers/podman/Artifacts/binary/podman-installer-macos-universal.pkg)
+  ,
+  [x86_64](https://api.cirrus-ci.com/v1/artifact/github/containers/podman/Artifacts/binary/podman-installer-macos-amd64.pkg)
+  , and
+  [arm64](https://api.cirrus-ci.com/v1/artifact/github/containers/podman/Artifacts/binary/podman-installer-macos-arm64.pkg)
+  installation packages.  Again, these are **not** signed, so expect warnings if you try to install them.
+  There's also binary release *ZIP-files* for
   [darwin_amd64](https://api.cirrus-ci.com/v1/artifact/github/containers/podman/Artifacts/binary/podman-remote-release-darwin_amd64.zip)
   and
   [darwin_arm64](https://api.cirrus-ci.com/v1/artifact/github/containers/podman/Artifacts/binary/podman-remote-release-darwin_arm64.zip).
-  if you try to install them.
 * Windows [podman-remote](https://api.cirrus-ci.com/v1/artifact/github/containers/podman/Artifacts/binary/podman-remote-release-windows_amd64.zip) for x86_64 only.
 * Other podman-remote release builds (includes configuration files & documentation):
   * [podman-release-386.tar.gz](https://api.cirrus-ci.com/v1/artifact/github/containers/podman/Artifacts/binary/podman-release-386.tar.gz)