Docs: Vault integration token creation docs missing command

[tcassaert]

On the Vault integration page, a snippet is shown to generate the token, but the command itself is missing:

Key             Value
---             -----
token           f02f01c2-c0d1-7cb7-6b88-8a14fada58c0
token_accessor  8cb7fcb3-9a4f-6fbf-0efc-83092bb0cb1c
token_duration  259200s
token_renewable true
token_policies  [default nomad-server]

This due to a missing line end. This PR fixes this.

[hashicorp-cla]

All committers have signed the CLA.

[notnoop]

Thanks for catching and fixing this!

[cgbaker]

merged into release-0.11.3

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