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Context registration management (aka NGSI9) hasn't been yet included in NGSIv2 API stable specification. Although some draft operations have been included in the Work-in-progress version of the specification (the document you cite at http://telefonicaid.github.io/fiware-orion/api/v2/latest) note that they are not included in the current stable Release Candidate (RC 2016.05 at the moment of writing this) document: http://telefonicaid.github.io/fiware-orion/api/v2/stable

Moreover, that document states (in the "Status" section) that NGSI9 is yet pending work:

[...] Nonetheless new functionalities will be added in the near future, particularly JSON-LD and NGSI9 (context registration) support