Update supported-log-outputs.adoc

[amandverma]

Updated logging supported version for splunk.
Reference document: https://docs.openshift.com/container-platform/4.16/observability/logging/log_collection_forwarding/configuring-log-forwarding.html#logging-forward-splunk_configuring-log-forwarding:~:text=Red%20Hat%20OpenShift%20Logging%20Operator%205.6%20or%20later

Update correct version of logging in document of Supported log output types for Splunk

Version(s):

4.16
Issue:

https://issues.redhat.com/browse/OBSDOCS-1160
Link to docs preview:

https://85034--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/logging/log_collection_forwarding/logging-output-types.html
QE review:

• QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Fri Nov 15 17:31:41 - Prow CI generated the docs preview:

https://85034--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/logging/log_collection_forwarding/logging-output-types.html

[openshift-ci]

@amandverma: all tests passed!

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[amandverma]

/label peer-review-needed

[lahinson]

LGTM. Be sure to get QE approval before you request merge review. Thanks!

[amandverma]

/label merge-review-needed

[ShaunaDiaz]

@amandverma Have QE sign off prior to merge.

[kabirbhartiRH]

LGTM from Logging QE

[openshift-bot]

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