Doc fix: Contract testing tutorial errors

Description

In https://docs.corda.net/head/tutorial-test-dsl.html:

Assignee

Dan Newton

Reporter

Joel Dudley

Epic Link

None

Priority

Medium

Engineering Teams

None

Fix versions

Affects versions

Ported to...

None

Sprint

None

Labels

None

Story Points / Dev Days

None

Feature Team

Corda Core

Severity

Medium
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