Update OpenAPI Documentation for Bearer Token

[MackHalliday]

User Story - Business Need

We need to update our OpenAPI documentation to accurately represent how our token is formatted.
Under the 'Available Authorization' > 'serviceAuth', the follow text should be updated:

"The format of this token is {key_name}-{iss-uuid}-{secret-key-uuid}. should be updated to "The format of this token is "Bearer <value>".

• Ticket is understood, and QA has been contacted (if the ticket has a QA label).

User Story(ies)

As a VANotify developer maintaining the Notification-API repo
I want to update the OpenAPI documentation on token formatting
So that the documentation reflects our tokens formatting accurately.

Additional Info and Resources

• See notification-api/documents/openapi/openapi.yaml
• Slack conversation on issue

Acceptance Criteria

• OpenAPI documentation was updated correctly
• This work is added to the sprint review slide deck (key win bullet point and demo slide)

QA Considerations

• Confirm update to documentation was implemented correctly.

Potential Dependencies

[cris-oddball]

@cris-oddball to update this ticket.