Update Synthetics Template variables

[git-thuerk-done]

What does this PR do? What is the motivation?

This PR adds the following:

• Adds synthetics.attributes.* values where it was missing in the prefix to avoid confusion of the exact variable name
• Removes shortcuts as this is a more advanced feature (will add to a different section later)
• Removes the examples as this is a JSON response not an example a customer can use in their synthetics test (will be adding examples later)
• Adds HTTP to the Protocol tests tab as this was missing.

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/aliciatheurk/template-variables-upate/synthetics/notifications/template_variables

[brett0000FF]

Looks good! Just one minor typo I found.