docs(blog): fix typo and add link to prismjs utility

[Splaktar]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/scullyio/scully/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Other... Please describe: docs typo fix

What is the current behavior?

• typo

Issue Number: N/A

What is the new behavior?

• typo fixed and now there is link to the prismjs utility

Does this PR introduce a breaking change?

• Yes
• No

Other information