Typo in Schemas-> referenceType section of the SDK documentation

[vr-delphix]

** Expected Behavior**
The referenceType section (https://developer.delphix.com/References/Schemas/#referencetype) in the SDK documentation has some typos here:
Environment: UNIX_HOST_ENVIRONMENT
Environment User: HOST_USER

This should actually be "UnixHostEnvironment" and "EnvironmentUser" instead of "UNIX_HOST_ENVIRONMENT" and "HOST_USER" respectively.

** Actual Behavior**
When I ran dvp upload with a schema that uses "UNIX_HOST_ENVIRONMENT" and "HOST_USER", it fails like this:
(venv) delphix@ip-10-110-199-101:~/qa-appdata-toolkits/toolkits/unix/direct/nix_direct_python$ dvp upload -e localhost -u admin --password delphix
API request failed with HTTP Status 200
Details: {u'discoveryDefinition': {u'repositorySchema': {u'properties': {u'repoEnvUser': {u'"matches"': {u'action': None, u'diagnoses': None, u'commandOutput': None, u'details': u"The 'matches' keyword is only valid for the referenceType 'EnvironmentUser'.", u'id': u'exception.validation.matches.only.host.user'}, u'"referenceType"': {u'action': None, u'diagnoses': None, u'commandOutput': None, u'details': u'The string "HOST_USER" is not a valid reference type.', u'id': u'exception.validation.invalid.ref.type'}}, u'repoEnv': {u'"referenceType"': {u'action': None, u'diagnoses': None, u'commandOutput': None, u'details': u'The string "UNIX_HOST_ENVIRONMENT" is not a valid reference type.', u'id': u'exception.validation.invalid.ref.type'}}}}}}
Action: Check your input parameters and try again.

Steps To Reproduce the Problem

1. Add the referenceType fields in the plugin schema and run "dvp upload" cmd.

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Version
SDK 3.1.0

Additional Context
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