Update Documentation for AWS_XRAY_CONTEXT_MISSING allowed values like IGNORE_ERROR

[gautam-nutalapati]

Hi We are using latest X-Ray core SDK com.amazonaws:aws-xray-recorder-sdk-core:2.9.1
I am trying to suppress the log Suppressing AWS X-Ray context missing exception.
I was able to find IGNORE_ERROR is also an allowed value for ENV variable AWS_XRAY_CONTEXT_MISSING in code base at

aws-xray-sdk-java/aws-xray-recorder-sdk-core/src/main/java/com/amazonaws/xray/strategy/ContextMissingStrategy.java

Line 21 in c14447e

* Environment variable key used to override the default {@code ContextMissingStrategy} used in new instances of

However, Java configuration documentation does not mention this acceptable value: https://docs.aws.amazon.com/xray/latest/devguide/xray-sdk-java-configuration.html

Is this intentional? If not, can we please update the documentation to include this?

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