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website: Fix table and example code on Default page (hashicorp#697)

Reference: https://developer.hashicorp.com/terraform/plugin/framework/resources/default

It looks like the production Markdown renderer will cause the page to not be loaded when a table is incorrectly defined, rather than fallback to an errant display of that table as it does locally.

This also fixes the example to use the released `stringdefault.StaticString()` function instead of the prior naming used during development.

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