Add Rails problem in multi version developer docs

What does this MR do?

• Add Rails problem in multi version developer docs

Related issues

https://gitlab.com/gitlab-org/release/retrospectives/-/issues/38

Author's checklist (required)

• Follow the Documentation Guidelines and Style Guide.
• If you have Developer permissions or higher:
  • Ensure that the product tier badge is added to doc's h1.
  • Apply the documentation label, plus:
    • The corresponding DevOps stage and group labels, if applicable.
    • development guidelines when changing docs under doc/development/*, CONTRIBUTING.md, or README.md.
    • development guidelines and Documentation guidelines when changing docs under development/documentation/*.
    • development guidelines and Description templates (.gitlab/*) when creating/updating issue and MR description templates.
  • Request a review from the designated Technical Writer.

Do not add the feature, frontend, backend, ~"bug", or database labels if you are only updating documentation. These labels will cause the MR to be added to code verification QA issues.

When applicable:

• Update the permissions table.
• Link docs to and from the higher-level index page, plus other related docs where helpful.
• Add the product tier badge accordingly.
• Add GitLab's version history note(s).
• Add/update the feature flag section.

Review checklist

All reviewers can help ensure accuracy, clarity, completeness, and adherence to the Documentation Guidelines and Style Guide.

1. Primary Reviewer

• Review by a code reviewer or other selected colleague to confirm accuracy, clarity, and completeness. This can be skipped for minor fixes without substantive content changes.

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  • Ensure docs metadata are present and up-to-date.
  • Ensure Technical Writing and documentation are added.
  • Add the corresponding docs:: scoped label.
  • If working on UI text, add the corresponding UI Text scoped label.
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For suggestions that you are confident don't need to be reviewed, change them locally and push a commit directly to save others from unneeded reviews. For example:

• Clear typos, like this is a typpo.
• Minor issues, like single quotes instead of double quotes, Oxford commas, and periods.

For more information, see our documentation on Merging a merge request.

3. Maintainer

1. Review by assigned maintainer, who can always request/require the above reviews. Maintainer's review can occur before or after a technical writer review.
2. Ensure a release milestone is set.
3. If there has not been a technical writer review, create an issue for one using the Doc Review template.

doc/development/multi_version_compatibility.md

@@ -43,6 +43,10 @@ Is it ok if all GitLab nodes have been updated, but the post-deployment migratio
 
 Is it ok if all nodes have been updated, and then the post-deployment migrations get executed a couple days later, and then the background migrations take a week to finish?
 
+### When upgrading a dependency like Rails
+
+Is it ok that some nodes have the new Rails version, but some nodes have the old Rails version?
+
 ## A walkthrough of an update
 
 Backwards compatibility problems during updates are often very subtle. This is why it is worth familiarizing yourself with [update instructions](../update/index.md), [reference architectures](../administration/reference_architectures/index.md), and [GitLab.com's architecture](https://about.gitlab.com/handbook/engineering/infrastructure/production/architecture/). But to illustrate how these problems arise, take a look at this example of a simple update.
@@ -102,6 +106,13 @@ Yes! We have specific instructions for [zero-downtime updates](../update/index.m
 
 ## I've identified a potential backwards compatibility problem, what can I do about it?
 
+### Coordinate
+
+For major or minor version updates of Rails or Puma:
+
+- Engage the Quality team to thoroughly test the MR.
+- Notify the `@gitlab-org/release/managers` on the MR prior to merging.
+
 ### Feature flags
 
 One way to handle this is to use a feature flag that is disabled by