Fix incorrect package doc link (#23679)

package doc link is changed in
https://github.com/go-gitea/gitea/pull/23629

options/locale/locale_en-US.ini

@@ -3149,7 +3149,7 @@ error.unit_not_allowed = You are not allowed to access this repository section.
 title = Packages
 desc = Manage repository packages.
 empty = There are no packages yet.
-empty.documentation = For more information on the package registry, see <a target="_blank" rel="noopener noreferrer" href="https://docs.gitea.io/en-us/packages/overview">the documentation</a>.
+empty.documentation = For more information on the package registry, see <a target="_blank" rel="noopener noreferrer" href="https://docs.gitea.io/en-us/usage/packages/overview/">the documentation</a>.
 empty.repo = Did you upload a package, but it's not shown here? Go to <a href="%[1]s">package settings</a> and link it to this repo.
 filter.type = Type
 filter.type.all = All