Read Token.nullValue() snippet from documentation example

[ansgarm]

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Description

Similar to other code blocks in our docs, we should retrieve these snippets from an example to also confirm them in CI:

terraform-cdk/website/docs/cdktf/concepts/tokens.mdx

Lines 68 to 94 in 5f60e02

	<CodeTabs>
	```typescript
	import { Token } from "cdktf";
	Token.nullValue()
	```
	```python
	from cdktf import Token
	Token.null_value()
	```
	```java
	import com.hashicorp.cdktf.Token;
	Token.nullValue()
	```
	```csharp
	using HashiCorp.Cdktf;
	Token.NullValue()
	```
	```go
	import "github.com/hashicorp/terraform-cdk-go/cdktf"
	cdktf.Token_NullValue()
	```
	</CodeTabs>

References

• Follow-up issue for feat(docs): document Token.nullValue() #2297