Issue Summary

As part of 8.0 we introduced two new BuildStates Cancelled and UNKNOWN but the documentation for POSTing buildstatuses was not updated accordingly:
https://developer.atlassian.com/server/bitbucket/rest/v811/api-group-builds-and-deployments/#api-api-latest-projects-projectkey-repos-repositoryslug-commits-commitid-builds-post
It does not mention the two new statuses. The Swagger docs for
com.atlassian.stash.internal.build.status.rest.BuildStatusResource#addBuildStatus needs to be updated

Steps to Reproduce

1. go to https://developer.atlassian.com/server/bitbucket/rest/v811/api-group-builds-and-deployments/#api-api-latest-projects-projectkey-repos-repositoryslug-commits-commitid-builds-post

Expected Results

All valid statues are listed so that I know which ones I can send

Actual Results

I can only see the 
SUCCESSFUL,  INPROGRESS. and FAILED

Workaround

Post  CANCELLED or  UNKNOWN  for build state and it works, but the documentation does not help me find this out (and as such I may not know if it is actually a supported state)