Add version history for token attribute
Update create PAT docs https://docs.gitlab.com/ee/api/resource_access_tokens.html#create-a-project-access-token so that version history for this endpoint clarifies that while the endpoint was introduced in 13.9, the token attribute was not included until later.
Following conversation with Chris in Slack (GitLab team members for the next 90 days: https://gitlab.slack.com/archives/C01AEL6E207/p1620826790455100).
FYI @cmutua
Ticket: 212125
Agent: Brie Carranza