Update size in logging-loki-zone-aware-rep.adoc

[nikijain30]

corrected size 1x.extra-small

Version(s):

4.14

Issue:

https://issues.redhat.com/browse/OBSDOCS-1377

Link to docs preview:

https://84120--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/logging/log_storage/cluster-logging-loki.html

QE review:

• [ ] QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Fri Oct 25 03:21:00 - Prow CI generated the docs preview:

https://84120--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/logging/log_storage/cluster-logging-loki.html

[openshift-ci[bot]]

@nikijain30: all tests passed!

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[nikijain30]

/label peer-review-needed

[kcarmichael08]

LGTM!

[nikijain30]

/label merge-review-needed