fix: Update explanation of selector.mode in environment configs page

[MuneebAijaz]

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[jeanduplessis]

Thank you for the update @MuneebAijaz.
Please update your commits to use the DCO signoff statement so we can merge it: https://github.com/crossplane/docs/pull/1038/checks?check_run_id=60127694378

[MuneebAijaz]

@jeanduplessis thanks for informing. I have updated the commits

[phisco]

Thanks @MuneebAijaz!