Add comment about patching custom resources on apply example

[dominic-p]

When running a patch operation on a custom resource the default strategic merge strategy can fail. Since it's difficult to identify custom resources, we leave a note to the developer that they need to be aware of this when using this example code.

See: #838

[linux-foundation-easycla]

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• ✅ login: dominic-p / name: Dominic (b9a1e2b)

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[brendandburns]

/lgtm
/approve

[brendandburns]

@dominic-p looks like CI/CD is failing.

[dominic-p]

It looks like one of the lines was a bit too long. It should be good to go now.

[brendandburns]

/lgtm
/approve

Thanks!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brendandburns, dominic-p

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