Document avoiding embedded structs for configs (and in general if possible)

[bogdandrutu]

Component(s)

No response

Describe the issue you're reporting

See #12718 (comment)

[BeElectronicSakshi]

@jmacd , @evan-bradley

Can you please assign this issue to me.

[dmitryax]

@BeElectronicSakshi, assigned. Thank you

[Ananyasinha13]

@dmitryax , Can you provide more context for this issue? Thanks

[BeElectronicSakshi]

@dmitryax , Thanks for assigning. Can you provide more details about this issue?