updated ServiceNow integration docs to eliminate confusion about files

[glasshash]

Description

clarification that extraction of downloaded zip is needed before uploading JAR file

[hashicorp-cla-app[bot]]

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1 out of 2 committers have signed the CLA.

• [x] schavis
• [ ] glasshash

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[hashicorp-cla-app[bot]]

Thank you for your submission! We require that all contributors sign our Contributor License Agreement ("CLA") before we can accept the contribution. Read and sign the agreement

Learn more about why HashiCorp requires a CLA and what the CLA includes

_{Have you signed the CLA already but the status is still pending? Recheck it.}

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[schavis]

@glasshash Please make sure to sign the CLA so we can merge your PR

[schavis]

We are migrating Vault content to a different repo. I could not merge this PR because the CLA needs to be signed. Please feel free to recreate this PR against the hashicorp/web-unified-docs repo on or after Monday, July 21, 2025.