Merge pull request #8080 from hashicorp/docs-mapkeys
docs: Fix map key interpolation documentation
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@ -27,9 +27,8 @@ will be rendered as a literal `${foo}`.
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variable name. For example, `${var.foo}` will interpolate the
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`foo` variable value. If the variable is a map, then you
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can reference static keys in the map with the syntax
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`var.MAP.KEY`. For example, `${var.amis.us-east-1}` would
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get the value of the `us-east-1` key within the `amis` variable
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that is a map.
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`var.MAP["KEY"]`. For example, `${var.amis["us-east-1"]` would
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get the value of the `us-east-1` key within the `amis` map variable.
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**To reference attributes of your own resource**, the syntax is
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`self.ATTRIBUTE`. For example `${self.private_ip_address}` will
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