Phoenix.View.unwrap_rendered_content/2

Parsed documentation:
Unwraps rendered String content within extension specific structure

## Examples

    iex> View.unwrap_rendered_content({:safe, "<h1>Hello!</h1>"}, ".html")
    "<h1>Hello!</h1>"
    iex> View.unwrap_rendered_content("Hello!", ".txt")
    "Hello!"
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