[21224] Update version support documentation (backport #4990) (backport #4995)

[mergify[bot]]

Description

This PR is a manual backport of the changes introduced in

• 4990

@Mergifyio backport 2.13.x 2.10.x

Contributor Checklist

• [x] Commit messages follow the project guidelines.

• N/A The code follows the style guidelines of this project.

• N/A Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally

• N/A Any new/modified methods have been properly documented using Doxygen.

• N/A Any new configuration API has an equivalent XML API (with the corresponding XSD extension)

• N/A Changes are backport compatible: they do NOT break ABI nor change library core behavior.

• N/A Changes are API compatible.

• N/A New feature has been added to the versions.md file (if applicable).

• N/A New feature has been documented/Current behavior is correctly described in the documentation.

• [x] Applicable backports have been included in the description.

Reviewer Checklist

• [x] The PR has a milestone assigned.
• [x] The title and description correctly express the PR's purpose.
• [x] Check contributor checklist is correct.
• [x] If this is a critical bug fix, backports to the critical-only supported branches have been requested.
• [x] Check CI results: changes do not issue any warning.
• [x] Check CI results: failing tests are unrelated with the changes.

  ---

  This is an automatic backport of pull request #4995 done by Mergify.

[mergify[bot]]

Cherry-pick of 501ba8c1855faaf78807a28bf3bd46f7674bf0f6 has failed:

On branch mergify/bp/2.10.x/pr-4995
Your branch is up to date with 'origin/2.10.x'.

You are currently cherry-picking commit 501ba8c18.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
    both modified:   .github/pull_request_template.md
    both modified:   README.md
    both modified:   RELEASE_SUPPORT.md

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally