build(generated): Add missing wiremock stub for delete of missing doc

[cloudant-sdks-automation]

Automated PR triggered by new code generation. fix(generated): add missing wiremock stub for delete of missing doc

Generated SDK source code using:

• Generator version 3.69.0
• Specification version 1.0.0-dev0.0.51
• Automation (cloudant-sdks) version a470783