Improve Markdown diff readability

[tstromberg]

The + marks and the criticality levels are confusing to people.

Previous Risk: ✅ 2/MEDIUM
New Risk:      🚨 4/CRITICAL

|    RISK     |                     KEY                      |                                                                   DESCRIPTION                                                                    |
|-------------|----------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------|
| +4/CRITICAL | **3P/godmoderules/iddqd/god/mode**           | detects a wide array of cyber threats, from malware and ransomware to advanced persistent threats (APTs), by Florian Roth                        |
| +4/CRITICAL | **3P/signature_base/3cxdesktopapp/backdoor** | detects 3CXDesktopApp MacOS Backdoor component, by X__Junior (Nextron Systems)                                                                   |