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copy doc note from terraform-providers/terraform-provider-aws/2162 (#16940)

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website/docs/configuration/interpolation.html.md
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@ -141,6 +141,13 @@ Terraform ships with built-in functions. Functions are called with the
syntax `name(arg, arg2, ...)`. For example, to read a file:
`${file("path.txt")}`.
~> **NOTE**: Proper escaping is required for JSON field values containing quotes
(`"`) such as `environment` values. If directly setting the JSON, they should be
escaped as `\"` in the JSON, e.g. `"value": "I \"love\" escaped quotes"`. If
using a Terraform variable value, they should be escaped as `\\\"` in the
variable, e.g. `value = "I \\\"love\\\" escaped quotes"` in the variable and
`"value": "${var.myvariable}"` in the JSON.
### Supported built-in functions
The supported built-in functions are: