Merge branch 'add-link-to-release-post-deprecations' into 'master'

Add links to deprecations release posts to deprecation policy

See merge request gitlab-org/gitlab!63029

doc/development/deprecation_guidelines/index.md

@@ -24,8 +24,13 @@ deprecated.
 
 A feature can be deprecated at any time, provided there is a viable alternative.
 
+Deprecations should be announced via [release posts](https://about.gitlab.com/handbook/marketing/blog/release-posts/#deprecations).
+
 ## When can a feature be removed/changed?
 
+Generally, feature or configuration can be removed/changed only on major release.
+It also should be [deprecated in advance](https://about.gitlab.com/handbook/marketing/blog/release-posts/#deprecations).
+
 For API removals, see the [GraphQL](../../api/graphql/index.md#deprecation-and-removal-process) and [GitLab API](../../api/README.md#compatibility-guidelines) guidelines.
 
 For configuration removals, see the [Omnibus deprecation policy](https://docs.gitlab.com/omnibus/package-information/deprecation_policy.html).