[DOCS] Updates navigation titles and descriptions for release notes

[KOTungseth]

Updates the navigation titles, adds short descriptions, and removes release dates.

[Copilot]

Pull Request Overview

This PR updates the navigation titles, refines the descriptive text for release notes, and removes release dates across multiple documentation pages. Key changes include updating navigation titles for deprecations, breaking changes, and known issues, along with revising the upgrade instructions and eliminating release date fields.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
docs/release-notes/deprecations.md	Updated navigation title and revised deprecation description.
docs/release-notes/breaking-changes.md	Updated navigation title and refined introduction text.
docs/release-notes/known-issues.md	Changed navigation title to better reflect content.
docs/release-notes/index.md	Removed release date entries and updated section labels.

Comments suppressed due to low confidence (1)

docs/release-notes/index.md:15

• Possible typo: 'felasticsearch' should likely be 'elasticsearch'.

 % ## version.next [felasticsearch-apache-hadoop-next-release-notes]

[georgewallace]

gentle ping @jbaiera . Mind taking a look at the release note refactors we have for ES Hadoop?

[jbaiera]

I think these changes look fine, though I'm wondering where we will be keeping release notes for the project going forward. They used to be under the appendix and separated by release version. Are we meant to inline them in the remaining files from now on?