Add a doctest for blank_line()
#16
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@ -23,6 +23,17 @@ impl Builder {
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/// This is equivilent to calling [`text()`] with an empty string, or pushing a blank
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/// [`Node`]
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///
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/// ```
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/// # use gemtext::Builder;
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/// let greeting = Builder::new()
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/// .text("Hello")
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/// .blank_line()
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/// .text("universe")
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/// .to_string();
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///
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/// assert_eq!(greeting.trim(), "Hello\n\nuniverse");
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/// ```
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///
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/// [`text()`]: Self::text()
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pub fn blank_line(mut self) -> Self {
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self.nodes.push(Node::blank());
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