Merge pull request github#190 from casals/patch-6

Update package-immutability.md

data/reusables/package_registry/package-immutability.md

@@ -1,3 +1,5 @@
-To prevent confusion and build problems, {% data variables.product.prodname_dotcom %} permanently reserves a package's name and version number. Even if an entire package is deleted, you cannot reuse the deleted package name in any repository owned by the same account.
+**Public packages:** To prevent confusion and build problems, {% data variables.product.prodname_dotcom %} permanently reserves a package's name and version number. Even if an entire package is deleted, you cannot reuse the deleted package name in any repository owned by the same account.
+
+**Private packages:** If all versions of a private package are deleted, you can publish a package with a previously used name and version.
 
 To revise or replace a package version, we recommend you publish a new version of your package.