docs(lambda-nodejs): fix default runtime docs

[J11522]

With #26763 the default runtime was reverted from NODEJS_18_X to NODEJS_16_X
This PR reflects this in the docs of the NodejsFunctionProps

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[mrgrain]

This is the logic:
https://github.com/aws/aws-cdk/blame/83e37e863ee6cb8ce8c02f6f9c47de5fd2c6bef5/packages/aws-cdk-lib/aws-lambda-nodejs/lib/function.ts#L131-L135

I don't think we can just say Node16 here....

[J11522]

This is the logic: https://github.com/aws/aws-cdk/blame/83e37e863ee6cb8ce8c02f6f9c47de5fd2c6bef5/packages/aws-cdk-lib/aws-lambda-nodejs/lib/function.ts#L131-L135

I don't think we can just say Node16 here....

True. I added the explanation to the runtime default

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[mrgrain]

@Mergifyio update

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