number-prefixed words in multi-line descriptions trigger generator error

[idiomatic]

Describe the bug
A description containing words like "720p" throws:

Error: Unexpected token p at 403:23

upon generating Swift via swift-graphql.

To Reproduce
Add a documented type to a schema:

"""
Resolution
Example: Medium is 720p
"""
enum Resolution {
  LOW
  MEDIUM
  HIGH
}

Start GraphQL server, then confirm description integrity:

curl -X POST -H"Content-Type: application/json" -d '{"query":"query{__type(name:\"Resolution\") {name description}}"}' http://localhost:8080/query

Resulting in:

{"data":{"__type":{"name":"Resolution","description":"Resolution\nExample: Medium is 720p"}}}

Generate Swift:

swift-graphql http://localhost:8080/query

Expected behavior
Swift output.