[W-11235578] Adding DLB continuos update patching docs

[arodriguez150]

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[nishantkakar]

@arodriguez150 Can we please add the definition of what's considered production since it's based on VPCs. Something like if the DLB is part of a VPC that is default or associated with at least one production environment, it will be considered as production DLB

[arodriguez150]

@nishantkakar I have added the definition of a Production DLB as a note when we mention how we schedule the update.