Changed case of npm

Related to: https://gitlab.com/gitlab-org/gitlab/-/issues/321335

doc/administration/index.md

@@ -154,8 +154,8 @@ Learn how to install, configure, update, and maintain your GitLab instance.
 
 ## Package Registry administration
 
-- [Container Registry](packages/container_registry.md): Configure Container Registry with GitLab.
-- [Package Registry](packages/index.md): Enable GitLab to act as an NPM Registry and a Maven Repository.
+- [Container Registry](packages/container_registry.md): Configure GitLab to act as a registry for containers.
+- [Package Registry](packages/index.md): Enable GitLab to act as a registry for packages.
 - [Dependency Proxy](packages/dependency_proxy.md): Configure the Dependency Proxy, a local proxy for frequently used upstream images/packages.
 
 ### Repository settings