Add raw tags to code blocks

[lucascosti]

Fixes: #287

Why:

Code blocks with context/expression syntax were included without escaping them in {% raw %} tags. This meant that the liquid processing stripped out those mentions.

What's being changed:

Added {% raw %} tags to the affected clode blocks.

Stage preview: https://docs-305--lucascosticomplex-wo.herokuapp.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows

Check off the following:

• All of the tests are passing.
• I have reviewed my changes in staging.
• For content changes, I have reviewed the localization checklist
• For content changes, I have reviewed the Content style guide for GitHub Docs.

[welcome]

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[martin389]

Looks good to me! Thanks @lucascosti 🎸

[github-actions]

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