SUMO-261315: Documentation | V1V2 Migration (Varnish, StrimziKafka, SquidProxy, IIS7/8) (#5351)

* Updating Strimzi Kafka, SquidProxy, Varnish docs

* updating iis 7 docs

* Update strimzi-kafka.md

* Update iis-7.md

* Update squid-proxy.md

* Update varnish.md

* Update strimzi-kafka.md

* Update iis-7.md

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Co-authored-by: Amee Lepcha <[email protected]>

Author: chetanchoudhary-sumo