[BUG] Explaination missing of what Persistent/Transient mean in ResourceHealth

### API Spec link

https://github.com/Azure/azure-rest-api-specs/blob/07da438f8dc690946b39511467744ed889434de5/specification/resourcehealth/resource-manager/Microsoft.ResourceHealth/stable/2024-02-01/ResourceHealth.json

### API Spec version

2024-02-01

### Describe the bug

Within the rest-api spec of the Resource Health there is a reasonChronicityTypes. It does list the possible values as "Persistent" and "Transient" but does not explain what those mean. From testing I would say after a state change it will remain in "Transient" state for 20 minutes, afterwards if there are no further changes it will change to "Persistent". I guess you should note that in description of the values.

### Expected behavior

actual behavior + descriptions of that those states actually mean.

### Actual behavior

```
"reasonChronicity": {
"type": "string",
"description": "Chronicity of the availability transition.",
"enum": [
"Transient",
"Persistent"
],
"x-ms-enum": {
"name": "reasonChronicityTypes",
"modelAsString": true
}
},
```

### Reproduction Steps

Read API spec, discover missing description and the strings themselves are not self-explanatory.

### Environment

_No response_