Fix outdated Wazuh dashboard URL

[javimed]

Description

This PR updates an outdated URL in https://documentation.wazuh.com/4.8/user-manual/user-administration/single-sign-on/administrator/microsoft-entra-id.html to https://<WAZUH_DASHBOARD_URL>/app/wz-home

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.

[jnasselle]

Based on the original changes #6775 this seems to be replaced the whole URL to https://<WAZUH_DASHBOARD_URL>

[Tostti]

LGTM