Better document podOverrides in the Operators (and other small docs fixes)

[fhennig]

PodOverrides are only documented at the top level docs: https://docs.stackable.tech/home/stable/concepts/overrides#_pod_overrides but not in the Operators. We should reference the top level docs in the Operators to make it easier to find this feature for users if they are only reading the operator docs.

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1. docs: pod overrides and other improvements airflow-operator#513
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2. docs: pod overrides and other improvements druid-operator#630
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3. docs: pod overrides, better install instructions, improved wording hbase-operator#569
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4. docs: improve install section, improve style, add pod override info hdfs-operator#587
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5. docs: pod overrides hive-operator#517
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6. docs: various small improvements kafka-operator#763
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7. docs: various small docs fixes nifi-operator#683
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8. docs: wording improvements, better install instructions spark-k8s-operator#470
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9. document pod overrides superset-operator#545
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10. docs: improvements trino-operator#649
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11. docs: improvements zookeeper-operator#865
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12. docs: improvements opa-operator#632
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[maltesander]

all done!