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docs: clarify syntax for escaping dollar curlies
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@ -150,6 +150,21 @@ These special characters are escaped as follows:
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`''\` escapes any other character.
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A "dollar-curly" (`${`) can be written as follows:
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> **Example**
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>
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> ```nix
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> ''
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> echo ''${PATH}
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> ''
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> ```
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>
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> "echo ${PATH}\n"
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> **Note**
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>
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> This differs from the syntax for escaping a dollar-curly within double quotes (`"\${"`). Be aware of which one is needed at a given moment.
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A "double-dollar-curly" (`$${`) can be written literally.
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> **Example**
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