Add note for apt installations

[Tostti]

Description

This PR adds a note to the upgrade central components section, for apt installations noting that if the opensearch_dashboards.yml was modified, the system will ask to either keep the modified version or replace it with the updated one, meaning that the user will have to manually add the changes later.

Checks

Docs building

• [x] Compiles without warnings.

Code formatting and web optimization

• [x] Uses three spaces indentation.
• [x] Adds or updates meta descriptions accordingly.
• [x] Updates the redirects.js script if necessary (check this guide).

Writing style

• [x] Uses present tense, active voice, and semi-formal registry.
• [x] Uses short, simple sentences.
• [x] Uses bold for user interface elements, italics for key terms or emphasis, and code font for Bash commands, file names, REST paths, and code.

[javimed]

Added a commit with a new suggestion which I can easily revert. And what about the yum upgrade? Should we remove the file before upgrading to force updating the file?

[Tostti]

Added a commit with a new suggestion which I can easily revert.

LGTM

And what about the yum upgrade? Should we remove the file before upgrading to force updating the file?

I think that it should. In that case we'll be sure that the file is completely replaced

[javimed]

@Tostti and @Desvelao have agreed to merge these changes.