[Spec] Clean up + fix outdated navigation references

[blu25]

The navigate algorithm has changed since we originally monkey patched it. This PR updates our monkey patch to reference the steps as they currently exist. This also cleans up the Should navigation response to navigation request be blocked by Permissions Policy? definition to match the formatting of other algorithms.

See issue: #179

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[domfarolino]

This also cleans up the Should navigation response to navigation request be blocked by Permissions Policy? definition to match the formatting of other algorithms.

Other algorithms in our spec, or in HTML? The current declaration of that algorithm seems pretty good / clear, what's wrong with it?

[blu25]

This also cleans up the Should navigation response to navigation request be blocked by Permissions Policy? definition to match the formatting of other algorithms.

Other algorithms in our spec, or in HTML? The current declaration of that algorithm seems pretty good / clear, what's wrong with it?

Most algorithms in our spec don't start with "Create a new algorithm called X..." but instead either just define the algorithm's name or state "To do X given Y, run these steps:". I think it's better for this algorithm to try to match the latter for consistency.