Add OVA troubleshooting section

[javimed]

Description

This PR backports the troubleshooting section to the Virtual Machine (OVA) installation guide including the steps to solve the "CPU has been disabled by the guest operating system" error message.

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.