cisco_imc_virtual_drive write_policy docs incorrect

[dsoper2]

write_policy:

  | description: This can be one of the following,
  | "Write Through" Data is written through the cache and to the physical drives. Performance is improved, because subsequent reads of that data can be satisfied from the cache.
***incorrect docs  | "Write Back Good BBU" Data is stored in the cache, and is only written to the physical drives when space in the cache is needed. Virtual drives requesting this policy fall back to Write Through caching when the BBU cannot guarantee the safety of the cache in the event of a power failure.
***incorrect docs  | "Write Back Bad BBU" “Always Write Back” With this policy, write caching remains Write Back even if the battery backup unit is defective or discharged.
  | choices: ["Always Write Back", "Write Back Good BBU", "Write Through", "always-write-back", "write-back-good-bbu", "write-through"]
  | default: "Write Through"
  | required: false