Added escaping to the description to prevent XSS

The description was likely vulnerable to XSS.

This vulnerability affects the following application versions:

• All in One SEO Pack 2.3.9
• All in One SEO Pack 2.3.9.1
• All in One SEO Pack 2.3.9.2
• All in One SEO Pack 2.3.10
• All in One SEO Pack 2.3.10.1
• All in One SEO Pack 2.3.10.2
• All in One SEO Pack 2.3.11
• All in One SEO Pack 2.3.11.1
• All in One SEO Pack 2.3.11.2
• All in One SEO Pack 2.3.11.3
• All in One SEO Pack 2.3.11.4
• All in One SEO Pack 2.3.12
• All in One SEO Pack 2.3.12.1
• All in One SEO Pack 2.3.12.2
• All in One SEO Pack 2.3.12.2.1
• All in One SEO Pack 2.3.12.3
• All in One SEO Pack 2.3.12.4
• All in One SEO Pack 2.3.12.5