Incorrect description merging

Using the following json-schema input:

```json
{
"$defs": {
"name": {
"type": "string",
"description": "name description"
},
"surname": {
"type": "string",
"description": "surname description"
}
},
"type": "object",
"properties": {
"name": {
"$ref": "#/$defs/name"
},
"surname": {
"$ref": "#/$defs/surname"
}
}
}
```

I get this output:

```json
{
"$schema": "http://json-schema.org/draft-06/schema#",
"$ref": "#/definitions/Coordinate",
"definitions": {
"Coordinate": {
"type": "object",
"additionalProperties": {},
"properties": {
"name": {
"type": "string",
"description": "name description\nsurname description"
},
"surname": {
"type": "string",
"description": "name description\nsurname description"
}
},
"required": [],
"title": "Coordinate"
}
}
}
```

The two description fields are incorrectly combined.

https://app.quicktype.io?share=TMZroOOQW4DAdf2qgsxS