API YAML files mention APIM

[Mariangela]

Description:

• [x] Check the content in all the REST API YAML files for the following terms and update it appropriately for APK

  • API Manager
  • apim:
  • APIM
  • WSO2 API Manager

• [x] Title in the Runtime API YAML and file name is inconsistent with the other API YAML docs.

[Mariangela]

Update

• PR #819 [1] addresses task 1 for the following YAMLs
  • backoffice-api.yaml
  • devportal-api.yaml
• Task 1 is pending for admin and runtime YAMLs
• Task 2 is pending for runtime YAML

[1] https://github.com/wso2/apk/pull/819

[Mariangela]

I updated the admin-api.yaml file in PR https://github.com/wso2/apk/pull/823

[Mariangela]

I updated the runtime-api.yaml file in PR https://github.com/wso2/apk/pull/864