(#1275) Clarify certificate usage in Quick Start Guide

[imm0rtalsupp0rt]

Description Of Changes

This commit expands the information provided in Step 1: Begin C4B Setup sub-step 2; the Self-Signed Certificate option. It now clarifies that the self-signed certificate will be generated automatically when the script is run.

Motivation and Context

Before clarifying that the self-signed certificate was created automatically, some users thought they needed to generate a self-signed certificate on their own. This clarification is designed to remedy that.

Testing

• I have previewed these changes using the Docker Container or another method before submitting this pull request.

Change Types Made

• Minor documentation fix (typos etc.).
• Major documentation change (refactoring, reformatting or adding documentation to existing page).
• New documentation page added.
• The change I have made should have a video added, and I have raised an issue for this.
  • Issue #

Change Checklist

• Requires a change to menu structure (top or left-hand side)/
• Menu structure has been updated
• Images added to the img repository?
  • PR -
• All items are complete on the Definition of Done.

Related Issue

Fixes #1275

[JPRuskin]

LGTM.