Typos in schema for ADMISSION and ADMISSION-VIEW events

[tomgillett]

Describe the bug
The ADMISSION and ADMISSION-VIEW events are mis-keyed in the Open API schema. See here and here.

• ADMISSION is keyed ADDMISSION and the enum shares the same typo. In our testing against AOS, the actual service expects ADMISSION and rejects a schema-compliant ADDMISSION with a HTTP 400.

• ADMISSION-VIEW is keyed ADDMISSION-VIEW, in this case, the enum does correlate with the value accepted by the AOS API: ADMISSION-VIEW

Expected behavior
Schema keys and enum values should presumably be ADMISSION and ADMISSION-VIEW to ensure the schema aligns with AOS.