Update Uninstalling Documentation on Wazuh Server

[JcabreraC]

Description

This PR updates the Wazuh Manager uninstalling documentation to prevent users from encountering errors related to disabling the Wazuh service after using the --purge option with APT or the yum remove command.

Checks

Docs building

• Compiles without warnings.

Code formatting and web optimization

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

Writing style

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

[juliancnn]

LGTM!