Update tostring.mdx for null value conversion

Per https://github.com/hashicorp/terraform/issues/33603, updating the documentation to accurately reflect the current implementation.
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Craig Wright 2023-07-28 15:11:06 -07:00 committed by GitHub
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@ -12,7 +12,7 @@ convert types automatically where required. Use the explicit type conversion
functions only to normalize types returned in module outputs.
Only the primitive types (string, number, and bool) and `null` can be converted to string.
All other values will produce an error.
`tostring(null)` produces a `null` value of type `string`. All other values will produce an error.
## Examples
@ -24,7 +24,7 @@ hello
> tostring(true)
true
> tostring(null)
null
tostring(null)
> tostring([])
Error: Invalid function argument