Add null to tostring docs
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@ -14,7 +14,7 @@ Explicit type conversions are rarely necessary in Terraform because it will
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convert types automatically where required. Use the explicit type conversion
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functions only to normalize types returned in module outputs.
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Only the primitive types (string, number, and bool) can be converted to string.
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Only the primitive types (string, number, and bool) and `null` can be converted to string.
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All other values will produce an error.
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## Examples
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@ -26,6 +26,8 @@ hello
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1
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> tostring(true)
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true
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> tostring(null)
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null
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> tostring([])
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Error: Invalid function argument
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