quoted-name

hint by default

An id or enum name in quotes can be written bare: minecraft:stone or stone rather than "minecraft:stone".

Changing it

Set the rule's severity in mms.json, to error, warning, info, hint or off:

{
  "lint": { "quoted-name": "off" }
}

To silence it on one line, write // mms-ignore quoted-name on the line or the line above. See Lint rules in the guides for more.