docs: remove apiExportName from helm values

[mstruebing]

Summary

I tried to follow the docs to get to a working sync agent and figured out this option is not supported anymore

What Type of PR Is This?

/kind documentation

Related Issue(s)

Fixes #

Release Notes

NONE

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[kcp-ci-bot]

Hi @mstruebing. Thanks for your PR.

I'm waiting for a kcp-dev member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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