Recipient types are case dependent in REST API calls
Recipient types are case dependent in REST API calls

Looking at the documentation I kept trying "to" but it failed with
"invalid JSON".

Then I stumbled on the thread in http://g/gerritcodereview-team/c/PMf4XK_DL0Y/m/n2XSKHeCCAAJ
which said that the value should be "TO".

Change-Id: I35aa061439b499e0c80cdc9858ed2f79f1a87b4d
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