Document simvars MCDU annunciator name error

[prius0304]

Aircraft Version

Stable

Build info

{
    "built": "2023-11-03T17:47:36+00:00",
    "ref": "refs/tags/v0.11.1",
    "sha": "f055eb02dc0af32441f8b2873f58e8316d7ca638",
    "actor": "Saschl",
    "event_name": "manual",
    "pretty_release_name": "stable/v0.11.1",
    "version": "v0.11.1-rel.f055eb0"
}

Describe the bug

in “fbw-a32nx/docs/a320-simvars.md” file

A32NX_MCDU_{side}ANNUNC{annunciator}
should be
A32NX_MCDU_{side}_ANNUNC_{annunciator}

Expected behavior

A32NX_MCDU_{side}_ANNUNC_{annunciator}

Steps to reproduce

no :)

References (optional)

No response

Additional info (optional)

No response

Discord Username (optional)

No response