[Bug]: missing-x-ms-identifiers misleading messages

[mjlshen]

Describe the bug

typespec-azure/packages/typespec-azure-resource-manager/src/rules/missing-x-ms-identifiers.ts

Lines 19 to 20 in 94c846a

	default: `Missing identifying properties of objects in the array item, please add @extension("x-ms-identifiers", [<prop>]) to specify it. If there are no appropriate identifying properties, please add @extension("x-ms-identifiers",[]).`,
	notArray: paramMessage`Value passed to @extension("x-ms-identifiers",...) was a "${"valueType"}". Pass an array of property name.`,

suggests the use of @extension("x-ms-identifiers", [<prop>]), however the actual decorator should be @OpenAPI.extension("x-ms-identifiers", [<prop>])

https://azure.github.io/typespec-azure/docs/libraries/azure-resource-manager/rules/missing-x-ms-identifiers

Reproduction

https://azure.github.io/typespec-azure/playground?c=aW1wb3J0ICJAdHlwZXNwZWMvcmVzdCI7CtIZaHR0cMwZYXp1cmUtdG9vbHMvyCUtxhVjb3Jl3yvIK3Jlc291cmNlLW1hbmFnZXIiOwoKdXNpbmcgVHlwZVNwZWMuUmVzdDvQFUh0dHDIFUHESi5Db3JlzhJSx1xNxls7CgpAc2VydmljZSgiV2lkZ2V0xxoiKQpuYW1lc3BhY2UgQ29udG9zby7NIjsKCm1vZGVsIEFkZHJlc3MgewogIGNpdHk6IHN0cmluZzsKIMQKZWV0yhJ9yDXoAIlQcm9wZXJ0aWXGQGFycmF5OshTW10KfQo%3D&e=%40azure-tools%2Ftypespec-autorest&options=%7B%7D

Checklist

• Follow our Code of Conduct
• Check that this issue is about the Azure libraries for typespec. For bug in the typespec language or core libraries file it in the TypeSpec repo
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• The provided reproduction is a minimal reproducible example of the bug.

[timotheeguerin]

The former does work if you have using OpenAPI; but we could use the fully qualified name in the message to reduce confusion