CI/CD Security Cheatsheet | fix typo "o" --> "of" && "enviornment" --> "environment"

[garrettpfoy]

Checklist:

• In case of a new Cheat Sheet, you have used the Cheat Sheet template.
• All the markdown files do not raise any validation policy violation, see the policy.
• All the markdown files follow these format rules.
• All your assets are stored in the assets folder.
• All the images used are in the PNG format.
• Any references to websites have been formatted as [TEXT](URL)
• You verified/tested the effectiveness of your contribution (e.g., the defensive code proposed is really an effective remediation? Please verify it works!).
• The CI build of your PR pass, see the build status here.

Basically just came across these two typos in the CI/CD security cheatsheet page. I scanned the rest of the page and couldn't find any further issues.

Cheers!