Documentation for using reflector for cross-namespace secret sync-ing

[winromulus]

Added documentation for using reflector for cross-namespace sync-ing of secrets.
There were numerous requests for documenting this with cert-manager from the extension's support channels.

[jetstack-bot]

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[winromulus]

/assign @maelvls

[JoshVanL]

Thanks @winromulus, would it be possible to add a redirect here, so that links to the old page (which only contained kubed) will now be directed to this new renamed page?

[winromulus]

@JoshVanL good point, I did not spot that. Adding now.

[JoshVanL]

Thanks @winromulus, this looks like it is doing the right thing.

/lgtm
/approve
/ok-to-test

[jetstack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JoshVanL, winromulus

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