Update input_value_validators.md
Typo?
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@ -50,7 +50,7 @@ Here is an example of a custom validator:
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```rust
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struct MustBeZero {}
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impl InputValueValidator for InputValueValidator {
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impl InputValueValidator for MustBeZero {
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fn is_valid(&self, value: &Value) -> Option<String> {
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if let Value::Int(n) = value {
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if n.as_i64().unwrap() != 0 {
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