[Documentation]Internews feedback: Add clarity on curl requirements

[JoGSal]

Description

Feedback received through Internews highlighted the need to "Explain that curl isn't installed on all Linux operating systems by defaut and that it may need to be installed manually before proceeding".

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.